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Review

Phemenology of Filling, Investigation of Growth Kinetics and Electronic Properties for Applications of Filled Single-Walled Carbon Nanotubes

by
Marianna V. Kharlamova
1,* and
Christian Kramberger
2,*
1
Centre for Advanced Materials Application (CEMEA), Slovak Academy of Sciences, Dúbravská cesta 5807/9, 845 11 Bratislava, Slovakia
2
Faculty of Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
*
Authors to whom correspondence should be addressed.
Nanomaterials 2023, 13(2), 314; https://0-doi-org.brum.beds.ac.uk/10.3390/nano13020314
Submission received: 19 December 2022 / Revised: 5 January 2023 / Accepted: 7 January 2023 / Published: 12 January 2023
(This article belongs to the Special Issue Applications of Functionalized Carbon Nanomaterials: Advances and Perspectives)
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Abstract

:
This review discusses the phemenology of filling, the investigation of kinetics, and the electronic properties for applications of filled single-walled carbon nanotubes (SWCNTs), and summarizes five main achievements that were obtained in processing the spectroscopic data of SWCNTs filled with metal halogenide, metal chalcogenide, metal and metallocenes. First, the methods of processing kinetic data were developed to reveal precise trends in growth rates and activation energies of the growth of SWCNTs. Second, the metal-dependence of kinetics was revealed. Third, metallicity-sorted (metallic and semiconducting) SWCNTs were filled with a range of substances and the electronic properties were investigated. Fourth, new approaches to processing the data of spectroscopic investigations of filled SWCNTs were developed, which allowed more reliable and precise analysis of the experimental results. Fifth, the correlation between the physical and chemical properties of encapsulated substances and the electronic properties of SWCNTs were elucidated. These points are highlighted in the review.

1. Introduction

Single-walled carbon nanotubes (SWCNTs) are promising materials for a wide range of applications, such as molecular electronics, nanocomposites, solar cells, sensors, and electrochemistry lithium-ion batteries (Figure 1) [1,2,3,4,5,6,7,8,9].
SWCNTs are modified in different ways to perform the functionalization of the inner, outer surface and insert substances in inner channels, i.e., perform filling. These methods include covalent functionalization of the outer surface, noncovalent functionalization, substitution of atoms in the walls of SWCNTs, electrochemical doping, filling and nanochemical reactions within the nanotube channels [10]. The growth rates and activation energies of the growth of carbon nanotubes inside SWCNTs are calculated [11,12]. The kinetics of growth of the inner tubes are studied in detail by the annealing of metallocene-filled SWCNTs with a resolution of several minutes. It has been shown that nickel catalyst leads to higher growth rates at lower temperatures than cobalt catalyst. The activation energies are different for the two metals. Understanding the growth mechanism of SWCNTs leads to a better understanding of growth and electronic properties. The electronic properties of filled SWCNTs are studied mainly by Raman spectroscopy, near-edge X-ray absorption fine structure spectroscopy (NEXAFS), photoemission spectroscopy (PES) and optical absorption spectroscopy (OAS) [13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44]. Raman spectroscopy shows that there is a charge transfer in nanotubes filled with 3d, 4d, 4f, 5s and 6p-metal halogenides. We observed changes in the spectra shapes and shifts of peaks. NEXAFS reveals the formation of local chemical bonds. Photoemission spectra reveal shifts in the peaks. i.e., direct confirmation of doping with a charge transfer. The optical absorption spectroscopy confirms the charge transfer. These studies, which have been performed for almost two decades, are very important. They can lead to many excellent applications, in many different countries, including Russia.
In this review we discuss the phemenology of filling, the investigation of growth kinetics, and the electronic properties for the application of SWCNTs (Figure 2).
The SWCNTs were filled with molecules [45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119], metals and nonmetals, such as Ag, Cu, P, As, and I [120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153], metal halogenides, such as MHal (M=Ag, Cu, Hal=Cl, Br, I), MHal2 (M=Fe, Co, Ni, Mn, Zn, Cd, Pb, Hg, Hal=Cl, Br, I), and MHal3 (M=Pr, Tb, Tm, Lu, Hal=Cl, Br, I) [154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207], and metal chalcogenides, such as MX (M=Ga, Sn, X=S, Se, Te), and M2×3 (M=Bi, X=Se, Te) [208,209,210,211,212,213,214]. They are filled inside SWCNTs by the gas or melt methods; the synthesis process involves thermal treatment with cooling, and an investigation with spectroscopic techniques for applications.
In Section 2 of this review, we consider the kinetics of growth of carbon nanotubes, and trends in the metal-dependence of growth rates and activation energies. In Section 3, we carry out an investigation into the doping effects in metallicity-sorted SWCNTs filled with inorganic compounds. In Section 4, we produce a comparison of the doping effect of different inorganic compounds on SWCNTs. Section 5 comprises a comparison of the doping effect of inorganic compounds on different diameter SWCNTs. In Section 6, a discussion of the influence of different encapsulated substances on the electronic properties of SWCNTs is performed.

2. Studies on Filled SWCNTs

Molecules have been encapsulated inside SWCNTs in 74 papers [45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119], and the filled SWCNTs have been investigated for applications in spintronics, construction material, magnetic storage, and magnetic recording. These applications were reviewed by us recently [214]. They were also reviewed by the groups of Jeremy Sloan [215], Marc Monthioux [216], and Ferenc Simon [217]. The following studies are available:
  • The filling process of fullerenes and derivatives, as well as applications were studied by Hiromichi Kataura, Kazu Suenaga, Sumio Iijima, and Hisanori Shinohara [49,51,52,58,70,71,72,75,76,79,80,116].
  • Molecule-filled SWCNTs were synthesized for the investigation of growth kinetics of carbon nanotubes. The fullerenes coalesce and form an inner nanotube. The mechanism was studied by our group [218].
  • The synthesis process and catalysis properties of endohedral fullerene-filled SWCNTs were studied by Andrey Khlobystov and Thomas Chamberlain [48,53,54,55,81,83,84,85,86,112].
  • The filling process of SWCNTs with other molecules was analyzed by Ákos Botos and Katalin Kamaros [46].
  • The carbon nanotubes were also filled with molecules other than fullerenes, e.g., metallocenes, by Hidetsugu Shiozawa [59,95,96,97,98,109,110,111] and Marianna Kharlamova [105,106,107,108]. The growth properties of molecule-filled SWCNTs were reviewed in Ref. [219] where the growth mechanisms of carbon nanotubes were also discussed extensively.
Metals and nonmetals have been encapsulated inside SWCNTs in 33 papers [120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153]. These papers are dedicated to the filling of SWCNTs with iodine, phosphorous, arsenic, sulfur, selenium, silver, copper, and europium.
  • Extensive studies of the microstructure of filled SWCNTs have been performed.
  • The filling processes of SWCNTs have been analyzed, and the procedures have been optimized for the filling.
  • The electronic properties have been investigated by spectroscopy.
Among Russian scientists, Elena Obraztsova [123], Alexander Okotrub [129], and Marianna Kharlamova [141,142,147] filled SWCNTs with simple substances.
Metal halogenides and metal chalcogenides were filled inside SWCNTs in 60 papers [154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214]. They are listed above. Here, we present an overview of the novelties in the investigation of the kinetics and electronic properties of filled SWCNTs. The following was achieved [10].
  • The methods of processing of the kinetic data were developed to reveal precise trends in growth rates and activation energies of the growth of SWCNTs.
  • The metal-dependence of kinetics was revealed.
  • Metallicity-sorted (metallic and semiconducting) SWCNTs were filled with a range of substances. Indeed, only metallicity-mixed SWCNTs have previously been used for the filling [10]. The filling of metallicity-sorted SWCNTs allowed for the unambiguous assessment of the influence of encapsulated substances on the electronic properties of SWCNTs.
  • New approaches to processing the data of spectroscopic investigations of filled SWCNTs were developed, which allowed for a more reliable and precise analysis of the experimental results and for the drawing of clear conclusions about the influence of different fillers on the electronic properties of SWCNTs.
  • The correlation between the physical and chemical properties of encapsulated substances and their influence on the electronic properties of metallicity-sorted and mixed SWCNTs with different diameters was elucidated.

3. Kinetics of Growth of SWCNTs

The growth kinetics of SWCNTs are important, because it allows control of the synthesis process of carbon nanotubes. The parameters, such as the growth rates and activation energies of the growth of SWCNTs, allow us to choose synthesis conditions that lead to the highest yield of SWCNTs. The investigation of the growth mechanism of carbon nanotubes allows for the determining of the growth model and appropriate mathematical model for describing the experimental growth.
In Refs. [11,12], the kinetics of growth of carbon nanotubes inside nickelocene- and cobaltocene-filled SWCNTs were investigated. The synthesis was performed from the gas phase, followed by an investigation into the atomic structure, growth properties, chemical properties and electronic properties for applications.
Figure 3 shows the Raman spectroscopy data of cobaltocene-filled SWCNTs annealed at a temperature of 580 °C for 2–4168 min, acquired at laser wavelength of 633 nm and 568 nm [11]. The spectra demonstrate the increase in intensity of peaks of the inner tube at 175–325 cm−1, which corresponds to a growth of inner SWCNTs inside filled SWCNTs.
The growth rates and activation energies of the growth of inner SWCNTs were calculated for cobaltocene- and nickelocene-filled SWCNTs. Figure 4 compares the activation energies of the growth of nanotubes on cobalt and nickel clusters, formed upon the heating of metallocene-filled SWCNTs [220]. The activation energies Eα and Eβ of an initial fast and subsequent slow growth on the purely metallic Ni and Co particles equal ~1.5–1.9 eV and ~0.8–1.8 eV, respectively. For large tubes with a diameter above ~0.95 nm on the Ni catalyst, they are significantly larger than on the Co catalyst, and the values of the smaller tubes are equal. The difference in the Ni and Co is due to different diffusion rates.

4. Investigation of Doping Effects in Metallicity-Sorted SWCNTs Filled with Inorganic Compounds

Recently, new reports on the filling and investigation of metallicity-mixed and metallicity-sorted nanotubes were published (Figure 5).
Table 1 summarizes the encapsulated inorganic compounds, diameter and conductivity types of the host SWCNTs, methods of the investigation of the electronic properties, types of doping and the observed Fermi level shifts of SWCNTs.
The electronic properties of SWCNTs filled with manganese halogenides [175], iron halogenides [170], cobalt halogenides [190], nickel halogenides [167], zink halogenides, [169], cadmium halogenides [173], luthetium halogenides [184], mercury halogenies [172], and lead halogenides [177] were studied by Raman spectroscopy, near-edge X-ray absorption fine structure spectroscopy, photoemission spectroscopy, and optical absorption spectroscopy and p-doping with the Fermi level shift of −0.05–0.5 eV was revealed.
OAS was applied to investigate the direction of the charge transfer in filled SWCNTs in Refs. [155,156,167,169,170,173,182,190,207]. The OAS spectra demonstrated the suppression of the peaks of Van Hove singularities. This was attributed to the doping of SWCNTs with a lowering or increasing of the Fermi level of nanotubes. However, the direction of the charge transfer cannot be deduced from the OAS data (Figure 6) [212].
Raman spectroscopy was also used to study the electronic properties of filled SWCNTs in Refs. [155,156,163,164,167,169,170,172,173,175,177,182,183,184,190,200,207,211]. Raman spectra revealed the changes in the radial breathing mode and G-mode, such as shifts in the peaks and modification of the band profile. This testifies to the doping of SWCNTs by encapsulated compounds (Figure 7) [177].
XPS was employed to evaluate the direction and value of the Fermi level shift of the filled SWCNTs in Refs. [155,156,164,167,169,170,172,173,175,177,182,190,200,207]. The C 1s XPS spectra showed the shift in the peak and change in its width. The shift is caused by the charge transfer between SWCNTs and introduced compounds due to the Fermi level variation. The up- and downshift of SWCNTs corresponds to n- and p-doping of nanotubes by the encapsulated substances, respectively (Figure 8) [175]. UPS was used a direct method of investigation of the Fermi level shift in filled SWCNTs in Refs. [155,164,169]. The UPS spectra showed the shifts in the peaks of Van Hove singularities. This is evidence of the Fermi level shift in filled SWCNTs. The down- and upshift of the peaks corresponds to the lowering and increasing of the Fermi level of nanotubes.
NEXAFS was applied to analyze local interactions between encapsulated substances and SWCNTs in Refs. [155,156,167,169,170,172,173,182,207]. The modifications in the spectra may testify to the formation of chemical bonds between the nanotube walls and introduced substances (Figure 9) [212].
Authors of Refs. [161,162] filled the separated metallic and semiconducting SWCNTs with copper chloride. Using optical absorption spectroscopy and Raman spectroscopy, they showed that the encapsulated salt leads to p-doping of nanotubes. The efficiency of doping for the metallic-enriched SWCNT fraction was higher than that for the semiconducting SWCNTs. The functionalization of both semiconducting and metallic SWCNT films by filling nanotubes with CuCl led to a significant increase in optical transmittance (above 90% in the near-infrared field). The best absolute optical transmittance was observed for filled metallic SWCNT films.
In Ref. [163], high-purity semiconducting SWCNTs were filled with silver (I) chloride, and the multifrequency Raman spectra of filled and unfilled semiconducting SWCNTs were compared. Raman spectroscopy at five laser wavelengths allowed the investigating in detail of the electronic properties of the filled SWCNTs. Using different laser wavelengths allowed exciting electronic transitions of different semiconducting nanotubes and the study of the influence of the incorporated silver (I) chloride on their electronic properties. The RBM and G-bands of the Raman spectra of the pristine and filled SWCNTs were fitted with individual components. The peak positions and relative intensities of individual components of the RBM and G-bands of the pristine and filled SWCNTs were compared. Changes in peak intensities and appearance of new peaks in the RBM-band of the filled SWCNTs as compared to the pristine SWCNTs were revealed (Figure 10a). This testified to the filling-induced alteration in the resonance excitation conditions of nanotubes due to a charge transfer in the filled nanotubes that causes exciting optical transitions in smaller or larger diameter nanotubes using the laser with the same wavelength. Additionally, the prominent shifts in the components of the G-band of the filled SWCNTs as compared to the pristine SWCNTs as well as no changes in the component intensities were revealed (Figure 10a). The shifts in the components of the G-band were found to be independent of laser wavelength. These shifts were attributed to p-doping of SWCNTs by the inserted silver (I) chloride accompanied by the charge transfer from nanotubes to the salt.
Authors of Ref. [164] filled high-purity metallic SWCNTs with silver (I) chloride. The filled and unfilled SWCNTs were investigated by Raman spectroscopy, XPS and UPS, which were combined to study comprehensively the modified electronic properties of the filled SWCNTs. XPS confirmed the chemical composition of the encapsulated compound. A detailed analysis of Raman spectra of the pristine and filled SWCNTs allowed the investigation of filling-induced changes in the electronic properties of SWCNTs. The RBM and G-bands of the Raman spectra were fitted with individual components. The analysis of the RBM-band testified to the disappearance of the peak in the largest-diameter filled metallic SWCNTs, which was attributed to the changes in their resonance conditions. The analysis of the G-band revealed upshifts in the components of the filled SWCNTs and the changed profile of the band. This indicated doping of SWCNTs by the encapsulated silver (I) chloride and gap opening in the band structure of the filled SWCNTs, resulting in a transition of metallic nanotubes into semiconducting SWCNTs. The direction of the charge transfer in the filled SWCNTs was determined by XPS. The observed downshift of the C 1s XPS peak of the filled SWCNTs of 0.36 eV as well as its broadening were attributed to p-doping of SWCNTs accompanied by the charge transfer from the nanotubes to the inserted silver (I) chloride (Figure 10b). The detailed information on the doping-induced shift of the Fermi level of SWCNTs upon their filling was obtained by UPS. The UPS spectra of the filled SWCNTs demonstrated the downshift of the π-resonance by 0.36 eV, which was a direct confirmation of the downshift of the Fermi level of nanotubes (Figure 10c).
The above-mentioned reports demonstrate the effect of the encapsulated materials on the electronic properties on either purely metallic or semiconducting SWCNTs. They also showcase the potential of precise Fermi level engineering of SWCNTs by filling their channels and achieving high doping levels. This control over the electronic properties will be the key to design the next generation of SWCNT-based nanoelectronic devices.
Different encapsulated inorganic compounds have a different influence on the electronic properties of host SWCNTs. Several authors investigated the correlation between the chemical nature of the incorporated inorganic compound and their doping effect on nanotubes.
In Ref. [191], a systematic comparison of the doping effect of encapsulated nickel (II) bromide, cobalt (II) bromide and iron (II) bromide on SWCNTs was conducted using Raman spectroscopy. The authors compared the relative intensities of and shifts in the peaks of the RBM and G-bands of the Raman spectra of the filled nanotubes (Figure 11). The RBM-band was fitted with two components corresponding to nanotubes of different diameters. In the spectrum of the pristine SWCNTs, the first component corresponding to the larger-diameter SWCNTs had a larger intensity. The relative intensity of two RBM peaks was changed upon the filling of nanotubes. In the spectra of the filled SWCNTs, the second component corresponding to the smaller-diameter SWCNTs had the larger intensity. The largest changes as compared to the pristine SWCNTs were observed for the SWCNTs filled with iron (II) bromide (Figure 11a). On the basis of these data, it was concluded that iron (II) bromide has a larger doping effect on SWCNTs than either cobalt (II) bromide or nickel (II) bromide.
The results of the line shape analysis of the G-band of the Raman spectra of the filled SWCNTs were in agreement with the results of the fitting of the RBM-band. Figure 11b compares the shifts in the components of the G-bands and the relative intensities of the Breit−Wigner−Fano component (G−LO) for the pristine SWCNTs and filled nanotubes. It can be seen that the upshifts of all components of the G-band increase in line with nickel (II) bromide-cobalt (II) bromide-iron (II) bromide. In addition, the relative intensity of the metallic G−LO component decreases significantly in the spectra of the filled SWCNTs as compared to the pristine nanotubes. The largest difference is again observed for the SWCNTs filled with iron (II) bromide. Taking into consideration these data, authors concluded that the iron (II) bromide has the largest p-doping effect on SWCNTs, whereas nickel (II) bromide has the smallest effect. This is explained by the different ionization potentials of iron, cobalt, and nickel. It is the minimal for iron, and it is maximal for nickel. Here the anion is the same, but the size of the anion and electron affinity of halogen plays an important role.
In Ref. [183], a systematic comparison of the doping effect of the encapsulated terbium (III) chloride, terbium (III) bromide and terbium (III) iodide on SWCNTs was conducted using Raman spectroscopy. The fitting of the RBM and G-bands of the Raman spectra of the filled SWCNTs and comparison of the relative intensities of and shifts in the peaks showed that the p-doping effect on SWCNTs increases in line with terbium (III) iodide–terbium (III) bromide–terbium (III) chloride.
Combining the OAS, Raman spectroscopy and photoemission data allowed the authors of Refs. [155,156,177] to investigate in detail the influence of the anion type of the encapsulated metal halogenides on the doping level of SWCNTs. For halogenides of silver and copper, it was revealed that the p-doping level of SWCNTs increases in line with metal iodide–metal bromide–metal chloride [155,156]. For halogenides of lead, the strongest p-doping effect on SWCNTs was observed for lead (II) iodide, whereas the weakest p-doping effect was revealed for lead (II) bromide [177].
In Ref. [208], a comparison of the doping effect of the encapsulated tin, gallium and bismuth chalcogenides was performed using the data of OAS, Raman spectroscopy and XPS. It was shown that the encapsulation of tin sulfide inside the SWCNTs does not cause significant changes in the electronic structure of semiconducting SWCNTs, whereas there is a slight influence on metallic nanotubes. The introduction of gallium telluride inside the SWCNTs results in a downshift in the Fermi level of SWCNTs, i.e., p-doping of the nanotubes. The filling of SWCNTs with bismuth selenide does not lead to the modification of the electronic properties of nanotubes.

5. Comparison of Doping Effect of Inorganic Compounds on Different Diameter SWCNTs

In Ref. [165], the authors performed a comparison of the doping levels of silver (I) chloride-filled metallicity-mixed SWCNTs with diameters of 1.4 and 1.9 nm synthesized by the arc-discharge and chemical vapor deposition methods, respectively. The electronic properties of the filled SWCNTs were investigated by Raman spectroscopy and XPS. The analysis of the Raman spectroscopy data acquired at laser wavelengths of 514 and 633 nm revealed the shifts and changes in the relative intensities of the components of the RBM-bands of the filled 1.4 nm-diameter SWCNTs, which are a result of the alteration in resonance excitation conditions of nanotubes upon their filling [165]. The RBM-band of the Raman spectrum of the filled 1.9 nm-diameter SWCNTs was completely suppressed; this was probably caused by the presence of large-diameter silver (I) chloride nanocrystal inside the SWCNT channel that distorted the radial symmetry of nanotubes. The G-band of the Raman spectra of the filled 1.4 and 1.9 nm-diameter SWCNTs showed significant upshifts, which were attributed to p-doping of SWCNTs by the encapsulated silver (I) chloride. In addition, the data indicated different filling ratios of 1.4 and 1.9 nm-diameter SWCNTs [165]. The XPS data confirmed that the filling of SWCNTs with silver (I) chloride led to the p-doping of nanotubes and downshift of their Fermi level. The C 1s XPS peaks of the filled 1.4 and 1.9 nm-diameter SWCNTs showed downshift values of 0.40 and 0.23 eV as compared to the pristine nanotubes, which may testify to the different doping levels of SWCNTs. Larger doping levels of the arc-discharge 1.4 nm-diameter SWCNTs as compared to the CVD 1.9 nm-diameter nanotubes were explained by the different filling ratios of SWCNTs, which are probably caused by differences in synthetic protocols of the pristine SWCNTs [165].

6. Discussion of the Influence of Different Encapsulated Substances on the Electronic Properties of SWCNTs

The analysis of the literature shows that metal halogenides inside SWCNTs (Figure 12a), whose work function (WF) is larger (Figure 12b) or smaller (Figure 12c) than the value of SWCNTs lead to the downshift or upshift in the Fermi level of SWCNTs, accordingly. These metal halogenides are MHal (M=Ag, Cu, Hal=Cl, Br, I), MHal2 (M=Fe, Co, Ni, Mn, Zn, Cd, Pb, Hg, Hal = Cl, Br, I), MHal3 (M=Pr, Tb, Tm, Lu, Hal=Cl, Br, I) [154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,198,199,200,201,202,203,204,205,206,207]. Metal chalcogenides, whose work function is larger (Figure 12d) or equal (Figure 12e) to the value of SWCNTs lead to the downshift in the Fermi level of SWCNTs, or no changes in the electronic structure of nanotubes, accordingly. These metal chalcogenides are MX (M=Ga, Sn, X=S, Se, Te), M2×3 (M=Bi, X=Se, Te) [208,209,210,211,212,213,214]. Elementary substances–metals (Figure 12f) and non-metals (Figure 12g), whose work functions are smaller or larger than the values of SWCNTs, or molecules (Figure 12h) result in the upshift or downshift of the Fermi level of SWCNTs, accordingly. These substances are Ag, Cu, Eu, P, As, I [45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153]. The discussion is as follows:
  • Regarding kinetics of growth of carbon nanotubes, the growth mechanism of SWCNTs was revealed. The application of Raman spectroscopy allowed us to calculate the growth rates and activation energies. They are in the range of 0.5 to 3.0 eV. No activation energies for growth of individual carbon nanotubes were reported thus far.
  • The authors showed the metal-dependence of growth kinetics, and that the use of different metal catalyst precursors allowed analyzing the influence of metal on the growth mechanism of SWCNTs. It was shown that different metals lead to different growth mechanisms of carbon nanotubes. More TEM investigations are required to analyze the mechanism in detail.
  • Regarding the filling of metallicity-sorted SWCNTs, separated metallic, semiconducting SWCNT samples were proved to be a viable tool to unravel the effects of the filler on the electronic properties of the compound material. The investigation of the macroscopic electronic properties by a variety of spectroscopic methods (OAS, RS, XPS, UPS and XAS) allowed us to thoroughly address the influences on the electronic properties that are caused by encapsulated elementary substances, inorganic compounds and molecules.
  • The authors developed new approaches to processing the data of spectroscopic investigations of filled SWCNTs. There have been developments in the evaluation of spectroscopic data. The precise and reliable data analysis supported drawing clear conclusions on the quantitative charge transfer present in differently filled SWCNTs.
  • Regarding the correlation between the physical and chemical properties of encapsulated substances and the electronic properties of SWCNTs, the combined spectroscopic studies on filled SWCNTs allowed us to determine the charge transfer quantitatively. It can be evaluated as elementary charges per SWCNT surface atom, or additionally as elementary charges per SWCNT length. With the filling ratio and the interconversion of encapsulated substances, the doping level can be varied in a wide range. It is even possible to tune the doping level across the charge neutrality point and switch from n to p type doping. This powerful control of the electronic properties in heterogeneously filled SWCNTs enabled the demonstration of many different applications. The applications covered in this review include nanoelectronics, thermoelectric power generation, electrochemical energy storage, catalysis, sensors, spintronics, magnetic recording and biomedicine. This review also addresses current issues and likely contenders for a breakthrough in the near future, namely photovoltaics and light emission.
Nanomaterials 13 00314 g012 550
Figure 12. The schematics of the Fermi level shift in SWCNTs (a) filled with inorganic compounds–metal halogenides, whose work function (WF) is larger (b) or smaller (c) than the value of SWCNTs, and metal chalcogenides, whose work function is larger than (d) or equal (e) to the value of SWCNTs; elementary substances–metals (f) and non-metals (g), whose work functions are smaller or larger than the values of SWCNTs, respectively; and molecules (h).
Figure 12. The schematics of the Fermi level shift in SWCNTs (a) filled with inorganic compounds–metal halogenides, whose work function (WF) is larger (b) or smaller (c) than the value of SWCNTs, and metal chalcogenides, whose work function is larger than (d) or equal (e) to the value of SWCNTs; elementary substances–metals (f) and non-metals (g), whose work functions are smaller or larger than the values of SWCNTs, respectively; and molecules (h).
Nanomaterials 13 00314 g012

7. Conclusions

In this paper, we reviewed the kinetics of growth and the electronic properties of single-walled carbon nanotubes for applications. The use of methods of investigations allowed us to analyze in detail the properties of filled SWCNTs. New techniques of data processing were developed that allowed us to conclude about growth mechanisms and charge transfer mechanisms for filled SWCNTs toward applications. New samples were obtained, and their analysis confirmed the reported trends. Further progress is expected in controlled electronic properties of filled SWCNTs, which will, in conjunction with the wide range of demonstrated and envisaged applications, stimulate further advancements toward viable technologies built on them.

Author Contributions

The manuscript is written solely by M.V.K. who contributed as leading author to every reviewed paper. C.K. edited the manuscript. All authors have read and agreed to the published version of the manuscript.

Funding

These studies were partly performed during the implementation of the project Building-up Centre for advanced materials application of the Slovak Academy of Sciences, ITMS project code 313021T081 supported by the Research & Innovation Operational Programme funded by the ERDF. The APC was funded by Nanomaterials as an invited paper.

Data Availability Statement

Data are available on request to the first author (M.V.K.) of every reviewed paper.

Acknowledgments

Marianna V. Kharlamova acknowledges the coauthors of all the reviewed papers.

Conflicts of Interest

The author may have the conflict of interest with Andrei Eliseev (Lomonosov Moscow State University). The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

References

  1. Kharlamova, M.V. Electronic properties of pristine and modified single-walled carbon nanotubes. Phys.-Uspekhi. 2013, 56, 1047–1073. [Google Scholar] [CrossRef]
  2. Ferguson, V.; Silva, S.R.P.; Zhang, W. Carbon Materials in Perovskite Solar Cells: Prospects and Future Challenges. Energy Environ. Mater. 2019, 2, 107–118. [Google Scholar] [CrossRef] [Green Version]
  3. Fukumaru, T.; Fujigaya, T.; Nakashima, N. Development of n-type cobaltocene-encapsulated carbon nanotubes with remarkable thermoelectric property. Sci. Rep. 2015, 5, 7951. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  4. Lee, J.W.; Jeon, I.; Lin, H.S.; Seo, S.; Han, T.H.; Anisimov, A.; Kauppinen, E.I.; Matsuo, Y.; Maruyama, S.; Yang, Y. Vapor-Assisted Ex-Situ Doping of Carbon Nanotube toward Efficient and Stable Perovskite Solar Cells. Nano Lett. 2019, 19, 2223–2230. [Google Scholar] [CrossRef] [PubMed]
  5. Jordan, J.W.; Lowe, G.A.; McSweeney, R.L.; Stoppiello, C.T.; Lodge, R.W.; Skowron, S.T.; Biskupek, J.; Rance, G.A.; Kaiser, U.; Walsh, D.A.; et al. Host-Guest Hybrid Redox Materials Self-Assembled from Polyoxometalates and Single-Walled Carbon Nanotubes. Adv. Mater. 2019, 31, 41. [Google Scholar] [CrossRef]
  6. Martincic, M.; Tobias, G. Filled carbon nanotubes in biomedical imaging and drug delivery. Expert Opin. Drug Deliv. 2014, 12, 563–581. [Google Scholar] [CrossRef]
  7. Liu, B.L.; Wu, F.Q.; Gui, H.; Zheng, M.; Zhou, C.W. Chirality-Controlled Synthesis and Applications of Single-Wall Carbon Nanotubes. ACS Nano 2017, 11, 31–53. [Google Scholar] [CrossRef]
  8. Bati, A.S.R.; Yu, L.P.; Batmunkh, M.; Shapter, J.G. Recent Advances in Applications of Sorted Single-Walled Carbon Nanotubes. Adv. Funct. Mater. 2019, 29, 30. [Google Scholar] [CrossRef]
  9. Moore, K.E.; Tune, D.D.; Flavel, B.S. Double-Walled Carbon Nanotube Processing. Adv. Mater. 2015, 27, 3105–3137. [Google Scholar] [CrossRef]
  10. Kharlamova, M.V. Advances in tailoring the electronic properties of single-walled carbon nanotubes. Prog. Mater. Sci. 2016, 77, 125–211. [Google Scholar] [CrossRef]
  11. Kharlamova, M.V.; Kramberger, C.; Sato, Y.; Saito, T.; Suenaga, K.; Pichler, T.; Shiozawa, H. Chiral vector and metal catalyst-dependent growth kinetics of single-wall carbon nanotubes. Carbon 2018, 133, 283–292. [Google Scholar] [CrossRef]
  12. Kharlamova, M.V.; Kramberger, C.; Saito, T.; Sato, Y.; Suenaga, K.; Picher, T.; Shiozawa, H. Chirality-dependent growth of single-wall carbon nanotubes as revealed inside nano-test tubes. Nanoscale 2017, 9, 7998–8006. [Google Scholar] [CrossRef] [Green Version]
  13. Tkachenko, N.V. Optical Spectroscopy: Methods and Instrumentations; Elsevier: Amsterdam, The Netherlands, 2006. [Google Scholar]
  14. Kharlamova, M.V.; Kramberger, C.; Sauer, M.; Yanagi, K.; Pichler, T. Comprehensive spectroscopic characterization of high purity metallicity-sorted single-walled carbon nanotubes. Phys. Status Solidi (b) 2015, 252, 2512–2518. [Google Scholar] [CrossRef]
  15. Ayala, P.; Miyata, Y.; De Blauwe, K.; Shiozawa, H.; Feng, Y.; Yanagi, K.; Kramberger, C.; Silva, S.R.P.; Follath, R.; Kataura, H.; et al. Disentanglement of the electronic properties of metallicity-selected single-walled carbon nanotubes. Phys. Rev. B 2009, 80, 205427. [Google Scholar] [CrossRef]
  16. Kuzmany, H. Solid-State Spectroscopy: An Introduction, 2nd ed.; Springer: Berlin/Heidelberg, Germany, 2009. [Google Scholar]
  17. Atalla, R.H.; Agarwal, U.P.; Bond, J.L. Raman spectroscopy. Springer series in wood science. In Methods in Lignin Chemistry; Springer: Berlin/Heidelberg, Germany, 1992; pp. 162–176. [Google Scholar]
  18. Smekal, A. The quantum theory of dispersion. Naturwissenschaften 1923, 11, 873–875. [Google Scholar] [CrossRef]
  19. Raman, C.V.; Krishnan, K.S. The optical analog of the Compton eect. Nature 1928, 121, 711. [Google Scholar] [CrossRef]
  20. Lamdsberg, G.; Mandelstam, L. A novel eect of light scattering in crystals. Naturwissenschaften 1928, 16, 5757-558. [Google Scholar]
  21. Maiman, T.H. Stimulated optical radiation in ruby. Nature 1960, 187, 493–494. [Google Scholar] [CrossRef]
  22. Porto, S.P.S.; Wood, D.L. Ruby optical maser as a raman source. J. Opt. Soc. Am. 1962, 52, 251–252. [Google Scholar] [CrossRef]
  23. Smith, E.; Dent, G. Modern Raman Spectroscopy: A Practical Approach; John Wiley & Sons Ltd.: Chichester, UK, 2005. [Google Scholar]
  24. Dresselhaus, M.S.; Dresselhaus, G.; Jorio, A.; Souza, A.G.; Saito, R. Raman spectroscopy on isolated single wall carbon nanotubes. Carbon 2002, 40, 2043–2061. [Google Scholar] [CrossRef]
  25. Araujo, P.T.; Maciel, I.O.; Pesce, P.B.C.; Pimenta, M.A.; Doorn, S.K.; Qian, H.; Hartschuh, A.; Steiner, M.; Grigorian, L.; Hata, K.; et al. Nature of the constant factor in the relation between radial breathing mode frequency and tube diameter for single-wall carbon nanotubes. Phys. Rev. B. 2008, 77, 24. [Google Scholar] [CrossRef]
  26. Fouquet, M.; Telg, H.; Maultzsch, J.; Wu, Y.; Chandra, B.; Hone, J.; Heinz, T.F.; Thomsen, C. Longitudinal Optical Phonons in Metallic and Semiconducting Carbon Nanotubes. Phys. Rev. Lett. 2009, 102, 7. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  27. Brown, S.D.M.; Corio, P.; Marucci, A.; Dresselhaus, M.S.; Pimenta, M.A.; Kneipp, K. Anti-Stokes Raman spectra of single-walled carbon nanotubes. Phys. Rev. B. 2000, 61, R5137–R5140. [Google Scholar] [CrossRef]
  28. Das, A.; Sood, A.K. Renormalization of the phonon spectrum in semiconducting single-walled carbon nanotubes studied by Raman spectroscopy. Phys. Rev. B. 2009, 79, 23. [Google Scholar] [CrossRef]
  29. Grimm, S.; Schiessl, S.P.; Zakharko, Y.; Rother, M.; Brohmann, M.; Zaumseil, J. Doping-dependent G-mode shifts of small diameter semiconducting single-walled carbon nanotubes. Carbon 2017, 118, 261–267. [Google Scholar] [CrossRef]
  30. Tsang, J.C.; Freitag, M.; Perebeinos, V.; Liu, J.; Avouris, P. Doping and phonon renormalization in carbon nanotubes. Nat. Nanotechnol. 2007, 2, 725–730. [Google Scholar] [CrossRef]
  31. Das, A.; Sood, A.K.; Govindaraj, A.; Saitta, A.M.; Lazzeri, M.; Mauri, F.; Rao, C.N.R. Doping in carbon nanotubes probed by Raman and transport measurements. Phys. Rev. Lett. 2007, 99, 13. [Google Scholar] [CrossRef] [Green Version]
  32. Kalbac, M.; Farhat, H.; Kavan, L.; Kong, J.; Dresselhaus, M.S. Competition between the Spring Force Constant and the Phonon Energy Renormalization in Electrochemically Doped Semiconducting Single-Walled Carbon Nanotubes. Nano Lett. 2008, 8, 3532–3537. [Google Scholar] [CrossRef]
  33. Zhang, L.; Liao, V.; Yu, Z.H. Raman spectroelectrochemistry of a single-wall carbon nanotube bundle. Carbon 2010, 48, 2582–2589. [Google Scholar] [CrossRef]
  34. Piscanec, S.; Lazzeri, M.; Robertson, J.; Ferrari, A.C.; Mauri, F. Optical phonons in carbon nanotubes: Kohn anomalies, Peierls distortions, and dynamic effects. Phys. Rev. B. 2007, 75, 3. [Google Scholar] [CrossRef] [Green Version]
  35. Lazzeri, M.; Piscanec, S.; Mauri, F.; Ferrari, A.C.; Robertson, J. Phonon linewidths and electron-phonon coupling in graphite and nanotubes. Phys. Rev. B. 2006, 73, 15. [Google Scholar] [CrossRef]
  36. Caudal, N.; Saitta, A.M.; Lazzeri, M.; Mauri, F. Kohn anomalies and nonadiabaticity in doped carbon nanotubes. Phys. Rev. B. 2007, 75, 11. [Google Scholar] [CrossRef] [Green Version]
  37. Nguyen, K.T.; Gaur, A.; Shim, M. Fano lineshape and phonon softening in single isolated metallic carbon nanotubes. Phys. Rev. Lett. 2007, 98, 14. [Google Scholar] [CrossRef]
  38. Farhat, H.; Son, H.; Samsonidze, G.G.; Reich, S.; Dresselhaus, M.S.; Kong, J. Phonon softening in individual metallic carbon nanotubes due to the Kohn anomaly. Phys. Rev. Lett. 2007, 99, 14. [Google Scholar] [CrossRef] [Green Version]
  39. Watts, J.F.; Wolstenholme, J. An Introduction to Surface Analysis by XPS and AES.; John Wiley & Sons, Ltd.: Chichester, UK, 2003. [Google Scholar]
  40. Leckrey, R. Ultraviolet Photoelectron Spectroscopy of Solids. Surface Analysis Methods in Materials Science; 1 Springer Series in Surface Sciences; O’Connor, D.J., Sexton, B.A., Smart, R.S.C., Eds.; Springer: Berlin/Heidelberg, Germany, 1992; Volume 23. [Google Scholar]
  41. Hertz, H. Uber einen einuss des ultravioletten lichtes auf die electrische entladung. Ann. Phys. 1887, 267, 983–1000. [Google Scholar] [CrossRef] [Green Version]
  42. Einstein, A. Uber einen die erzeugung und verwandlung des lichtes betreenden heuristischen gesichtspunkt. Ann. Phys. 1905, 322, 132–148. [Google Scholar] [CrossRef]
  43. Innes, P.D. On the velocity of the cathode particles emitted by various metals under the inuence of Röntgen rays, and its bearing on the theory of atomic disintegration. Proc. Roy. Soc. London Ser. A 1907, 79, 442–462. [Google Scholar]
  44. Briggs, D.; Grant, G.T. Perspectives on XPS and AES. Surface Analysis by Auger and X-ray Photoelectron Spectroscopy; IM Publications and SurfaceSpectra Limited: Chichester, UK, 2003; pp. 1–30. [Google Scholar]
  45. Smith, B.W.; Monthioux, M.; Luzzi, D.E. Encapsulated C-60 in carbon nanotubes. Nature 1998, 396, 323–324. [Google Scholar] [CrossRef]
  46. Botos, A.; Khlobystov, A.N.; Botka, B.; Hackl, R.; Szekely, E.; Simandi, B.; Kamaras, K. Investigation of fullerene encapsulation in carbon nanotubes using a complex approach based on vibrational spectroscopy. Phys. Status Solidi (b) 2010, 247, 2743–2745. [Google Scholar] [CrossRef]
  47. Burteaux, B.; Claye, A.; Smith, B.W.; Monthioux, M.; Luzzi, D.E.; Fischer, J.E. Abundance of encapsulated C-60 in single-wall carbon nanotubes. Chem. Phys. Lett. 1999, 310, 21–24. [Google Scholar] [CrossRef]
  48. Chamberlain, T.W.; Popov, A.M.; Knizhnik, A.A.; Samoilov, G.E.; Khlobystov, A.N. The Role of Molecular Clusters in the Filling of Carbon Nanotubes. ACS Nano 2010, 4, 5203–5210. [Google Scholar] [CrossRef] [PubMed]
  49. Hirahara, K.; Suenaga, K.; Bandow, S.; Kato, H.; Okazaki, T.; Shinohara, H.; Iijima, S. One-dimensional metallofullerene crystal generated inside single-walled carbon nanotubes. Phys. Rev. Lett. 2000, 85, 5384–5387. [Google Scholar] [CrossRef] [PubMed]
  50. Jeong, G.H.; Hirata, T.; Hatakeyama, R.; Tohji, K.; Motomiya, K. C-60 encapsulation inside single-walled carbon nanotubes using alkali-fullerene plasma method. Carbon 2002, 40, 2247–2253. [Google Scholar] [CrossRef]
  51. Kataura, H.; Maniwa, Y.; Kodama, T.; Kikuchi, K.; Hirahara, K.; Suenaga, K.; Iijima, S.; Suzuki, S.; Achiba, Y.; Kratschmer, W. High-yield fullerene encapsulation in single-wall carbon nanotubes. Synth. Met. 2001, 121, 1195–1196. [Google Scholar] [CrossRef]
  52. Kataura, H.; Maniwa, Y.; Abe, M.; Fujiwara, A.; Kodama, T.; Kikuchi, K.; Imahori, H.; Misaki, Y.; Suzuki, S.; Achiba, Y. Optical properties of fullerene and non-fullerene peapods. Appl. Phys. A 2002, 74, 349–354. [Google Scholar] [CrossRef]
  53. Khlobystov, A.N.; Britz, D.A.; Wang, J.W.; O’Neil, S.A.; Poliakoff, M.; Briggs, G.A.D. Low temperature assembly of fullerene arrays in single-walled carbon nanotubes using supercritical fluids. J. Mater. Chem. 2004, 14, 2852–2857. [Google Scholar] [CrossRef]
  54. Khlobystov, A.N.; Porfyrakis, K.; Kanai, M.; Britz, D.A.; Ardavan, A.; Shinohara, H.; Dennis, T.J.S.; Briggs, G.A.D. Molecular motion of endohedral fullerenes in single-walled carbon nanotubes. Aew. Chem. Int. Ed. 2004, 43, 1386–1389. [Google Scholar] [CrossRef] [Green Version]
  55. Khlobystov, A.N.; Britz, D.A.; Briggs, G.A.D. Molecules in carbon nanotubes. Accounts Chem. Res. 2005, 38, 901–909. [Google Scholar] [CrossRef]
  56. Luzzi, D.E.; Smith, B.W. Carbon cage structures in single wall carbon nanotubes: A new class of materials. Carbon 2000, 38, 1751–1756. [Google Scholar] [CrossRef]
  57. Monthioux, M.; Smith, B.W.; Burteaux, B.; Claye, A.; Fischer, J.E.; Luzzi, D.E. Sensitivity of single-wall carbon nanotubes to chemical processing: An electron microscopy investigation. Carbon 2001, 39, 1251–1272. [Google Scholar] [CrossRef]
  58. Shimada, T.; Ohno, Y.; Okazaki, T.; Sugai, T.; Suenaga, K.; Kishimoto, S.; Mizutani, T.; Inoue, T.; Taniguchi, R.; Fukui, N.; et al. Transport properties of C-78, C-90 and Dy@C-82 fullerenes-nanopeapods by field effect transistors. Physica E 2004, 21, 1089–1092. [Google Scholar] [CrossRef]
  59. Shiozawa, H.; Ishii, H.; Kihara, H.; Sasaki, N.; Nakamura, S.; Yoshida, T.; Takayama, Y.; Miyahara, T.; Suzuki, S.; Achiba, Y.; et al. Photoemission and inverse photoemission study of the electronic structure of C-60 fullerenes encapsulated in single-walled carbon nanotubes. Phys. Rev. B 2006, 73, 075406. [Google Scholar] [CrossRef]
  60. Simon, F.; Kuzmany, H.; Rauf, H.; Pichler, T.; Bernardi, J.; Peterlik, H.; Korecz, L.; Fulop, F.; Janossy, A. Low temperature fullerene encapsulation in single wall carbon nanotubes: Synthesis of N@C-60@SWCNT. Chem. Phys. Lett. 2004, 383, 362–367. [Google Scholar] [CrossRef] [Green Version]
  61. Sloan, J.; Dunin-Borkowski, R.E.; Hutchison, J.L.; Coleman, K.S.; Williams, V.C.; Claridge, J.B.; York, A.P.E.; Xu, C.G.; Bailey, S.R.; Brown, G.; et al. The size distribution, imaging and obstructing properties of C-60 and higher fullerenes formed within arc-grown single walled carbon nanotubes. Chem. Phys. Lett. 2000, 316, 191–198. [Google Scholar] [CrossRef]
  62. Smith, B.W.; Monthioux, M.; Luzzi, D.E. Carbon nanotube encapsulated fullerenes: A unique class of hybrid materials. Chem. Phys. Lett. 1999, 315, 31–36. [Google Scholar] [CrossRef]
  63. Smith, B.W.; Luzzi, D.E. Formation mechanism of fullerene peapods and coaxial tubes: A path to large scale synthesis. Chem. Phys. Lett. 2000, 321, 169–174. [Google Scholar] [CrossRef]
  64. Yudasaka, M.; Ajima, K.; Suenaga, K.; Ichihashi, T.; Hashimoto, A.; Iijima, S. Nano-extraction and nano-condensation for C-60 incorporation into single-wall carbon nanotubes in liquid phases. Chem. Phys. Lett. 2003, 380, 42–46. [Google Scholar] [CrossRef]
  65. Zhang, Y.; Iijima, S.; Shi, Z.; Gu, Z. Defects in arc-discharge-produced single-walled carbon nanotubes. Philos. Mag. Lett. 1999, 79, 473–479. [Google Scholar] [CrossRef]
  66. Simon, F.; Kramberger, C.; Pfeiffer, R.; Kuzmany, H.; Zolyomi, V.; Kurti, J.; Singer, P.M.; Alloul, H. Isotope engineering of carbon nanotube systems. Phys. Rev. Lett. 2005, 95, 017401. [Google Scholar] [CrossRef] [Green Version]
  67. Simon, F.; Kukovecz, A.; Kramberger, C.; Pfeiffer, R.; Hasi, F.; Kuzmany, H.; Kataura, H. Diameter selective reaction processes of single-wall carbon nanotubes. Phys. Rev. B 2005, 71, 165439. [Google Scholar] [CrossRef] [Green Version]
  68. Ashino, M.; Obergfell, D.; Haluska, M.; Yang, S.H.; Khlobystov, A.N.; Roth, S.; Wiesendanger, R. Atomically resolved mechanical response of individual metallofullerene molecules confined inside carbon nanotubes. Nat. Nanotechnol. 2008, 3, 337–341. [Google Scholar] [CrossRef] [PubMed]
  69. Chiu, P.W.; Gu, G.; Kim, G.T.; Philipp, G.; Roth, S.; Yang, S.F.; Yang, S. Temperature-induced change from p to n conduction in metallofullerene nanotube peapods. Appl. Phys. Lett. 2001, 79, 3845–3847. [Google Scholar] [CrossRef]
  70. Gloter, A.; Suenaga, K.; Kataura, H.; Fujii, R.; Kodama, T.; Nishikawa, H.; Ikemoto, I.; Kikuchi, K.; Suzuki, S.; Achiba, Y.; et al. Structural evolutions of carbon nano-peapods under electron microscopic observation. Chem. Phys. Lett. 2004, 390, 462–466. [Google Scholar] [CrossRef]
  71. Kitaura, R.; Imazu, N.; Kobayashi, K.; Shinohara, H. Fabrication of metal nanowires in carbon nanotubes via versatile nano-template reaction. Nano Lett. 2008, 8, 693–699. [Google Scholar] [CrossRef] [PubMed]
  72. Okazaki, T.; Suenaga, K.; Hirahara, K.; Bandow, S.; Iijima, S.; Shinohara, I.E. Real time reaction dynamics in carbon nanotubes. J. Am. Chem. Soc. 2001, 123, 9673–9674. [Google Scholar] [CrossRef]
  73. Okazaki, T.; Suenaga, K.; Hirahara, K.; Bandow, S.; Iijima, S.; Shinohara, H. Electronic and geometric structures of metallofullerene peapods. Phys. B Condens. Matter 2002, 323, 97–99. [Google Scholar] [CrossRef]
  74. Pichler, T.; Kramberger, C.; Ayala, P.; Shiozawa, H.; Knupfer, M.; Rummeli, M.H.; Batchelor, D.; Kitaura, R.; Imazu, N.; Kobayashi, K.; et al. Bonding environment and electronic structure of Gd metallofullerene and Gd nanowire filled single-wall carbon nanotubes. Phys. Status Solidi (b) 2008, 245, 2038–2041. [Google Scholar] [CrossRef]
  75. Suenaga, K.; Tence, T.; Mory, C.; Colliex, C.; Kato, H.; Okazaki, T.; Shinohara, H.; Hirahara, K.; Bandow, S.; Iijima, S. Element-selective single atom imaging. Science 2000, 290, 2280. [Google Scholar] [CrossRef]
  76. Ayala, P.; Kitaura, R.; Kramberger, C.; Shiozawa, H.; Imazu, N.; Kobayashi, K.; Mowbray, D.J.; Hoffmann, P.; Shinohara, H.; Pichler, T. A Resonant Photoemission Insight to the Electronic Structure of Gd Nanowires Templated in the Hollow Core of SWCNTs. Mater. Express 2011, 1, 30–35. [Google Scholar] [CrossRef]
  77. Debarre, A.; Jaffiol, R.; Julien, C.; Richard, A.; Nutarelli, D.; Tchenio, P. Antenna effect in dimetallofullerene peapods. Chem. Phys. Lett. 2003, 380, 6–11. [Google Scholar] [CrossRef]
  78. Smith, B.W.; Luzzi, D.E.; Achiba, Y. Tumbling atoms and evidence for charge transfer in La-2@C-80@SWNT. Chem. Phys. Lett. 2000, 331, 137–142. [Google Scholar] [CrossRef]
  79. Suenaga, K.; Okazaki, T.; Wang, C.R.; Bandow, S.; Shinohara, H.; Iijima, S. Direct imaging of Sc-2@C-84 molecules encapsulated inside single-wall carbon nanotubes by high resolution electron microscopy with atomic sensitivity. Phys. Rev. Lett. 2003, 90, 5. [Google Scholar] [CrossRef]
  80. Suenaga, K.; Taniguchi, R.; Shimada, T.; Okazaki, T.; Shinohara, H.; Iijima, S. Evidence for the intramolecular motion of Gd atoms in a Gd-2@C-92 nanopeapod. Nano Lett. 2003, 3, 1395–1398. [Google Scholar] [CrossRef]
  81. Britz, D.A.; Khlobystov, A.N.; Porfyrakis, K.; Ardavan, A.; Briggs, G.A.D. Chemical reactions inside single-walled carbon nano test-tubes. Chem. Commun. 2004, 37–39. [Google Scholar] [CrossRef]
  82. Sun, B.Y.; Sato, Y.; Suenaga, K.; Okazaki, T.; Kishi, N.; Sugai, T.; Bandow, S.; Iijima, S.; Shinohara, H. Entrapping of exohedral metallofullerenes in carbon nanotubes: (CsC60)(n)@SWNT nano-peapods. J. Am. Chem. Soc. 2005, 127, 17972–17973. [Google Scholar] [CrossRef]
  83. Chamberlain, T.W.; Champness, N.R.; Schroder, M.; Khlobystov, A.N. A Piggyback Ride for Transition Metals: Encapsulation of Exohedral Metallofullerenes in Carbon Nanotubes. Chem.–A Eur. J. 2010, 17, 668–674. [Google Scholar] [CrossRef]
  84. Chamberlain, T.W.; Meyer, J.C.; Biskupek, J.; Leschner, J.; Santana, A.; Besley, N.A.; Bichoutskaia, E.; Kaiser, U.; Khlobystov, A.N. Reactions of the inner surface of carbon nanotubes and nanoprotrusion processes imaged at the atomic scale. Nat. Chem. 2011, 3, 732–737. [Google Scholar] [CrossRef]
  85. Khlobystov, A.N. Carbon Nanotubes: From Nano Test Tube to Nano-Reactor. Acs Nano 2011, 5, 9306–9312. [Google Scholar] [CrossRef]
  86. Britz, D.A.; Khlobystov, A.N.; Wang, J.W.; O’Neil, A.S.; Poliakoff, M.; Ardavan, A.; Briggs, G.A.D. Selective host-guest interaction of single-walled carbon nanotubes with functionalised fullerenes. Chem. Commun. 2004, 2, 176–177. [Google Scholar] [CrossRef]
  87. Briones, A.; Liu, X.J.; Kramberger, C.; Saito, T.; Pichler, T. Nanochemical reactions by laser annealing of ferrocene filled single-walled carbon nanotubes. Phys. Status Solidi (b) 2011, 248, 2488–2491. [Google Scholar] [CrossRef]
  88. Guan, L.H.; Shi, Z.J.; Li, M.X.; Gu, Z.N. Ferrocene-filled single-walled carbon nanotubes. Carbon 2005, 43, 2780–2785. [Google Scholar] [CrossRef]
  89. Kocsis, D.; Kaptas, D.; Botos, A.; Pekker, A.; Kamaras, K. Ferrocene encapsulation in carbon nanotubes: Various methods of filling and investigation. Phys. Status Solidi (b) 2011, 248, 2512–2515. [Google Scholar] [CrossRef]
  90. Liu, X.J.; Kuzmany, H.; Saito, T.; Pichler, T. Temperature dependence of inner tube growth from ferrocene-filled single-walled carbon nanotubes. Phys. Status Solidi (b) 2011, 248, 2492–2495. [Google Scholar] [CrossRef]
  91. Liu, X.J.; Kuzmany, H.; Ayala, P.; Calvaresi, M.; Zerbetto, F.; Pichler, T. Selective Enhancement of Photoluminescence in Filled Single-Walled Carbon Nanotubes. Adv. Funct. Mater. 2012, 22, 3202–3208. [Google Scholar] [CrossRef]
  92. Plank, W.; Kuzmany, H.; Pfeiffer, R.; Saito, T.; Iijima, S. Raman scattering from ferrocene encapsulated in narrow diameter carbon nanotubes. Phys. Status Solidi (b) 2009, 246, 2724–2727. [Google Scholar] [CrossRef]
  93. Sauer, M.; Shiozawa, H.; Ayala, P.; Ruiz-Soria, G.; Kataura, H.; Yanagi, K.; Krause, S.; Pichler, T. In situ filling of metallic single-walled carbon nanotubes with ferrocene molecules. Phys. Status Solidi (b) 2012, 249, 2408–2411. [Google Scholar] [CrossRef]
  94. Shiozawa, H.; Pichler, T.; Pfeiffer, R.; Kuzmany, H.; Kataura, H. Ferrocene encapsulated in single-wall carbon nanotubes: A precursor to secondary tubes. Phys. Status Solidi (b) 2007, 244, 4102–4105. [Google Scholar] [CrossRef]
  95. Shiozawa, H.; Pichler, T.; Kramberger, C.; Gruneis, A.; Knupfer, M.; Buchner, B.; Zolyomi, V.; Koltai, J.; Kurti, J.; Batchelor, D.; et al. Fine tuning the charge transfer in carbon nanotubes via the interconversion of encapsulated molecules. Phys. Rev. B 2008, 77, 153402. [Google Scholar] [CrossRef] [Green Version]
  96. Shiozawa, H.; Giusca, C.E.; Silva, S.R.P.; Kataura, H.; Pichler, T. Capillary filling of single-walled carbon nanotubes with ferrocene in an organic solvent. Phys. Status Solidi (b) 2008, 245, 1983–1985. [Google Scholar] [CrossRef]
  97. Shiozawa, H.; Pichler, T.; Gruneis, A.; Pfeiffer, R.; Kuzmany, H.; Liu, Z.; Suenaga, K.; Kataura, H. A catalytic reaction inside a single-walled carbon nanotube. Adv. Mater. 2008, 20, 1443–1449. [Google Scholar] [CrossRef]
  98. Shiozawa, H.; Kramberger, C.; Pfeiffer, R.; Kuzmany, H.; Pichler, T.; Liu, Z.; Suenaga, K.; Kataura, H.; Silva, S.R.P. Catalyst and Chirality Dependent Growth of Carbon Nanotubes Determined Through Nano-Test Tube Chemistry. Adv. Mater. 2010, 22, 3685–3689. [Google Scholar] [CrossRef]
  99. Kharlamova, M.V.; Sauer, M.; Saito, T.; Krause, S.; Liu, X.; Yanagi, K.; Pichler, T.; Shiozawa, H. Inner tube growth properties and electronic structure of ferrocene-filled large diameter single-walled carbon nanotubes. Phys. Status Solidi (b) 2013, 250, 2575–2580. [Google Scholar] [CrossRef]
  100. Kharlamova, M.V.; Kramberger, C.; Saito, T.; Shiozawa, H.; Pichler, T. In situ Raman spectroscopy studies on time-dependent inner tube growth in ferrocene-filled large diameter single-walled carbon nanotubes. Phys. Status Solidi (b) 2014, 251, 2394–2400. [Google Scholar] [CrossRef]
  101. Sauer, M.; Shiozawa, H.; Ayala, P.; Ruiz-Soria, G.; Liu, X.J.; Chernov, A.; Krause, S.; Yanagi, K.; Kataura, H.; Pichler, T. Internal charge transfer in metallicity sorted ferrocene filled carbon nanotube hybrids. Carbon 2013, 59, 237–245. [Google Scholar] [CrossRef]
  102. Plank, W.; Pfeiffer, R.; Schaman, C.; Kuzmany, H.; Calvaresi, M.; Zerbetto, F.; Meyer, J. Electronic Structure of Carbon Nanotubes with Ultrahigh Curvature. ACS Nano 2010, 4, 4515–4522. [Google Scholar] [CrossRef]
  103. Briones-Leon, A.; Ayala, P.; Liu, X.J.; Yanagi, K.; Weschke, E.; Eisterer, M.; Jiang, H.; Kataura, H.; Pichler, T.; Shiozawa, H. Orbital and spin magnetic moments of transforming one-dimensional iron inside metallic and semiconducting carbon nanotubes. Phys. Rev. B 2013, 87, 195435. [Google Scholar] [CrossRef] [Green Version]
  104. Li, L.J.; Khlobystov, A.N.; Wiltshire, J.G.; Briggs, G.A.D.; Nicholas, R.J. Diameter-selective encapsulation of metallocenes in single-walled carbon nanotubes. Nat. Mater. 2005, 4, 481–485. [Google Scholar] [CrossRef]
  105. Kharlamova, M.V.; Kramberger, C.; Saito, T.; Shiozawa, H.; Pichler, T. Growth dynamics of inner tubes inside cobaltocene-filled single-walled carbon nanotubes. Appl. Phys. A. 2016, 122, 749. [Google Scholar] [CrossRef]
  106. Kharlamova, M.V.; Sauer, M.; Saito, T.; Sato, Y.; Suenaga, K.; Pichler, T.; Shiozawa, H. Doping of single-walled carbon nanotubes controlled via chemical transformation of encapsulated nickelocene. Nanoscale 2014, 7, 1383–1391. [Google Scholar] [CrossRef] [Green Version]
  107. Kharlamova, M.V.; Sauer, M.; Egorov, A.; Kramberger, C.; Saito, T.; Pichler, T.; Shiozawa, H. Temperature-dependent inner tube growth and electronic structure of nickelocene-filled single-walled carbon nanotubes. Phys. Status Solidi (b) 2015, 252, 2485–2490. [Google Scholar] [CrossRef]
  108. Kharlamova, M.V.; Kramberger, C.; Sauer, M.; Yanagi, K.; Saito, T.; Pichler, T. Inner tube growth and electronic properties of metallicity-sorted nickelocene-filled semiconducting single-walled carbon nanotubes. Appl. Phys. A 2018, 124, 247. [Google Scholar] [CrossRef]
  109. Shiozawa, H.; Pichler, T.; Kramberger, C.; Rummeli, M.; Batchelor, D.; Liu, Z.; Suenaga, K.; Kataura, H.; Silva, S.R.P. Screening the Missing Electron: Nanochemistry in Action. Phys. Rev. Lett. 2009, 102, 046804. [Google Scholar] [CrossRef] [PubMed]
  110. Shiozawa, H.; Kramberger, C.; Rummeli, M.; Batchelor, D.; Kataura, H.; Pichler, T.; Silva, S.R.P. Electronic properties of single-walled carbon nanotubes encapsulating a cerium organometallic compound. Phys. Status Solidi (b) 2009, 246, 2626–2630. [Google Scholar] [CrossRef]
  111. Shiozawa, H.; Silva, S.R.P.; Liu, Z.; Suenaga, K.; Kataura, H.; Kramberger, C.; Pfeiffer, R.; Kuzmany, H.; Pichler, T. Low-temperature growth of single-wall carbon nanotubes inside nano test tubes. Phys. Status Solidi (b) 2010, 247, 2730–2733. [Google Scholar] [CrossRef]
  112. Stoppiello, C.T.; Biskupek, J.; Li, Z.Y.; Rance, G.A.; Botos, A.; Fogarty, R.M.; Bourne, R.A.; Yuan, J.; Lovelock, K.R.J.; Thompson, P.; et al. A one-pot-one-reactant synthesis of platinum compounds at the nanoscale. Nanoscale 2017, 9, 14385–14394. [Google Scholar] [CrossRef]
  113. Sauer, M.; Briones-Leon, A.; Saito, T.; Yanagi, K.; Schulte, K.; Pichler, T.; Shiozawa, H. Tailoring the electronic properties of single-walled carbon nanotubes via filling with nickel acetylacetonate. Phys. Status Solidi (b) 2015, 252, 2546–2550. [Google Scholar] [CrossRef]
  114. Loebick, C.Z.; Majewska, M.; Ren, F.; Haller, G.L.; Pfefferle, L.D. Fabrication of Discrete Nanosized Cobalt Particles Encapsulated Inside Single-Walled Carbon Nanotubes. J. Phys. Chem. C 2010, 114, 11092–11097. [Google Scholar] [CrossRef]
  115. Morgan, D.A.; Sloan, J.; Green, M.L.H. Direct imaging of o-carborane molecules within single walled carbon nanotubes. Chem. Commun. 2002, 2442–2443. [Google Scholar] [CrossRef]
  116. Kataura, H.; Maniwa, Y.; Kodama, T.; Kikuchi, K.; Suzuki, S.; Achiba, Y.; Sugiura, K.; Okubo, S.; Tsukagoshi, K. One-dimensional system in carbon nanotubes. AIP Conf. Proc. 2003, 685, 349–353. [Google Scholar]
  117. Tschirner, N.; Brose, K.; Maultzsch, J.; Yanagi, K.; Kataura, H.; Thomsen, C. The influence of incorporated beta-carotene on the vibrational properties of single wall carbon nanotubes. Phys. Status Solidi (b) 2010, 247, 2734–2737. [Google Scholar] [CrossRef]
  118. Yanagi, K.; Miyata, Y.; Kataura, H. Highly stabilized beta-carotene in carbon nanotubes. Adv. Mater. 2006, 18, 437. [Google Scholar] [CrossRef]
  119. Takenobu, T.; Takano, T.; Shiraishi, M.; Murakami, Y.; Ata, M.; Kataura, H.; Achiba, Y.; Iwasa, Y. Stable and controlled amphoteric doping by encapsulation of organic molecules inside carbon nanotubes. Nat. Mater. 2003, 2, 683–688. [Google Scholar] [CrossRef]
  120. Fan, X.; Dickey, E.C.; Eklund, P.C.; Williams, K.A.; Grigorian, L.; Buczko, R.; Pantelides, S.T.; Pennycook, S.J. Atomic arrangement of iodine atoms inside single-walled carbon nanotubes. Phys. Rev. Lett. 2000, 84, 4621–4624. [Google Scholar] [CrossRef]
  121. Guan, L.H.; Suenaga, K.; Shi, Z.J.; Gu, Z.N.; Iijima, S. Polymorphic structures of iodine and their phase transition in confined nanospace. Nano Lett. 2007, 7, 1532–1535. [Google Scholar] [CrossRef]
  122. Kissell, K.R.; Hartman, K.B.; Van der Heide, P.A.W.; Wilson, L.J. Preparation of I-2@ SWNTs: Synthesis and spectroscopic characterization of I-2-loaded SWNTs. J. Phys. Chem. B 2006, 110, 17425–17429. [Google Scholar] [CrossRef]
  123. Tonkikh, A.A.; Tsebro, V.I.; Obraztsova, E.A.; Suenaga, K.; Kataura, H.; Nasibulin, A.G.; Kauppinen, E.I.; Obraztsova, E.D. Metallization of single-wall carbon nanotube thin films induced by gas phase iodination. Carbon 2015, 94, 768–774. [Google Scholar] [CrossRef]
  124. Hatakeyama, R.; Li, Y. Synthesis and electronic-property control of Cs-encapsulated single- and double-walled carbon nanotubes by plasma ion irradiation. J. Appl. Phys. 2007, 102, 034309. [Google Scholar] [CrossRef]
  125. Jeong, G.H.; Hatakeyama, R.; Hirata, T.; Tohji, K.; Motomiya, K.; Yaguchi, T.; Kawazoe, Y. Formation and structural observation of cesium encapsulated single-walled carbon nanotubes. Chem. Commun. 2003, 152–153. [Google Scholar] [CrossRef]
  126. Nishide, D.; Dohi, H.; Wakabayashi, T.; Nishibori, E.; Aoyagi, S.; Ishida, M.; Kikuchi, S.; Kitaura, R.; Sugai, T.; Sakata, M.; et al. Single-wall carbon nanotubes encaging linear chain C10H2 polyyne molecules inside. Chem. Phys. Lett. 2006, 428, 356–360. [Google Scholar] [CrossRef]
  127. Chancolon, J.; Archaimbault, F.; Pineau, A.; Bonnamy, S. Filling of carbon nanotubes with selenium by vapor phase process. J. Nanosci. Nanotech. 2006, 6, 82–86. [Google Scholar] [CrossRef]
  128. Chernysheva, M.V.; Kiseleva, E.A.; Verbitskii, N.I.; Eliseev, A.A.; Lukashin, A.V.; Tretyakov, Y.D.; Savilov, S.V.; Kiselev, N.A.; Zhigalina, O.M.; Kumskov, A.S.; et al. The electronic properties of SWNTs intercalated by electron acceptors. Physica E 2008, 40, 2283–2288. [Google Scholar] [CrossRef]
  129. Sedelnikova, O.V.; Gurova, O.A.; Makarova, A.A.; Fedorenko, A.D.; Nikolenko, A.D.; Plyusnin, P.E.; Arenal, R.; Bulusheva, L.G.; Okotrub, A.V. Light-Induced Sulfur Transport inside Single-Walled Carbon Nanotubes. Nanomaterials 2020, 10, 818. [Google Scholar] [CrossRef] [PubMed]
  130. Hart, M.; White, E.R.; Chen, J.; McGilvery, C.M.; Pickard, C.J.; Michaelides, A.; Sella, A.; Shaffer, M.S.P.; Salzmann, C.G. Encapsulation and Polymerization of White Phosphorus Inside Single-Wall Carbon Nanotubes. Aew. Chem. Int. Edit. 2017, 56, 8144–8148. [Google Scholar] [CrossRef] [PubMed]
  131. Hart, M.; Chen, J.; Michaelides, A.; Sella, A.; Shaffer, M.S.P.; Salzmann, C.G. One-Dimensional Arsenic Allotropes: Polymerization of Yellow Arsenic Inside Single-Wall Carbon Nanotubes. Aew. Chem. Int. Edit. 2018, 57, 11649–11653. [Google Scholar]
  132. Wang, Z.Y.; Shi, Z.J.; Gu, Z.N. Synthesis of single-walled carbon nanotube/metal nanoparticle hybrid materials from potassium-filled nanotubes. Carbon 2010, 48, 443–446. [Google Scholar] [CrossRef]
  133. Kiang, C.H.; Choi, J.S.; Tran, T.T.; Bacher, A.D. Molecular nanowires of 1 nm diameter from capillary filling of single-walled carbon nanotubes. J. Phys. Chem. B 1999, 103, 7449–7451. [Google Scholar] [CrossRef]
  134. Borowiak-Palen, E.; Mendoza, E.; Bachmatiuk, A.; Rummeli, M.H.; Gemming, T.; Nogues, J.; Skumryev, V.; Kalenczuk, R.J.; Pichler, T.; Silva, S.R.P. Iron filled single-wall carbon nanotubes-A novel ferromagnetic medium. Chem. Phys. Lett. 2006, 421, 129–133. [Google Scholar] [CrossRef]
  135. Borowiak-Palen, E.; Bachmatiuk, A.; Rummeli, M.H.; Gemming, T.; Pichler, T.; Kalenczuk, R.J. Iron filled singlewalled carbon nanotubes-synthesis and characteristic properties. Phys. Status Solidi (b) 2006, 243, 3277–3280. [Google Scholar] [CrossRef]
  136. Cui, T.T.; Pan, X.L.; Dong, J.H.; Miao, S.; Miao, D.Y.; Bao, X.H. A versatile method for the encapsulation of various non-precious metal nanoparticles inside single-walled carbon nanotubes. Nano Res. 2018, 11, 3132–3144. [Google Scholar] [CrossRef]
  137. Li, Y.F.; Kaneko, T.; Ogawa, T.; Takahashi, M.; Hatakeyama, R. Novel properties of single-walled carbon nanotubes with encapsulated magnetic atoms. Jpn. J. Appl. Phys. 2008, 47, 2048–2055. [Google Scholar] [CrossRef]
  138. Domanov, O.; Weschke, E.; Saito, T.; Peterlik, H.; Pichler, T.; Eisterer, M.; Shiozawa, H. Exchange coupling in a frustrated trimetric molecular magnet reversed by a 1D nano-confinement. Nanoscale 2019, 11, 10615–10621. [Google Scholar] [CrossRef] [Green Version]
  139. Sloan, J.; Hammer, J.; Zwiefka-Sibley, M.; Green, M.L.H. The opening and filling of single walled carbon nanotubes (SWTs). Chem. Commun. 1998, 347–348. [Google Scholar] [CrossRef]
  140. Govindaraj, A.; Satishkumar, B.C.; Nath, M.; Rao, C.N.R. Metal nanowires and intercalated metal layers in single-walled carbon nanotube bundles. Chem. Mater. 2000, 12, 202–205. [Google Scholar] [CrossRef]
  141. Kharlamova, M.V.; Niu, J.J. Comparison of metallic silver and copper doping effects on single-walled carbon nanotubes. Appl. Phys. A 2012, 109, 25–29. [Google Scholar] [CrossRef]
  142. Kharlamova, M.V.; Niu, J.J. Donor doping of single-walled carbon nanotubes by filling of channels with silver. J. Exp. Theor. Phys. 2012, 115, 485–491. [Google Scholar] [CrossRef]
  143. Borowiak-Palen, E.; Ruemmeli, M.H.; Gemming, T.; Pichler, T.; Kalenczuk, R.J.; Silva, S.R.P. Silver filled single-wall carbon nanotubes-synthesis, structural and electronic properties. Nanotechnology 2006, 17, 2415–2419. [Google Scholar] [CrossRef]
  144. Corio, P.; Santos, A.P.; Santos, P.S.; Temperini, M.L.A.; Brar, V.W.; Pimenta, M.A.; Dresselhaus, M.S. Characterization of single wall carbon nanotubes filled with silver and with chromium compounds. Chem. Phys. Lett. 2004, 383, 475–480. [Google Scholar] [CrossRef]
  145. Sloan, J.; Wright, D.M.; Woo, H.G.; Bailey, S.; Brown, G.; York, A.P.E.; Coleman, K.S.; Hutchison, J.L.; Green, M.L.H. Capillarity and silver nanowire formation observed in single walled carbon nanotubes. Chem. Commun. 1999, 699–700. [Google Scholar] [CrossRef]
  146. Zhang, Z.L.; Li, B.; Shi, Z.J.; Gu, Z.N.; Xue, Z.Q.; Peng, L.M. Filling of single-walled carbon nanotubes with silver. J. Mater. Res. 2000, 15, 2658–2661. [Google Scholar] [CrossRef]
  147. Kharlamova, M.V.; Niu, J.J. New method of the directional modification of the electronic structure of single-walled carbon nanotubes by filling channels with metallic copper from a liquid phase. JETP Lett. 2012, 95, 314–319. [Google Scholar] [CrossRef]
  148. Chamberlain, T.W.; Zoberbier, T.; Biskupek, J.; Botos, A.; Kaiser, U.; Khlobystov, A.N. Formation of uncapped nanometre-sized metal particles by decomposition of metal carbonyls in carbon nanotubes. Chem. Sci. 2012, 3, 1919–1924. [Google Scholar] [CrossRef]
  149. Costa, P.M.F.J.; Sloan, J.; Rutherford, T.; Green, M.L.H. Encapsulation of RexOy clusters within single-walled carbon nanotubes and their in tubulo reduction and sintering to Re metal. Chem. Mater. 2005, 17, 6579–6582. [Google Scholar] [CrossRef]
  150. Zoberbier, T.; Chamberlain, T.W.; Biskupek, J.; Kuganathan, N.; Eyhusen, S.; Bichoutskaia, E.; Kaiser, U.; Khlobystov, A.N. Interactions and Reactions of Transition Metal Clusters with the Interior of Single-Walled Carbon Nanotubes Imaged at the Atomic Scale. J. Am. Chem. Soc. 2012, 134, 3073–3079. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  151. Kitaura, R.; Nakanishi, R.; Saito, T.; Yoshikawa, H.; Awaga, K.; Shinohara, H. High-Yield Synthesis of Ultrathin Metal Nanowires in Carbon Nanotubes. Aew. Chem. Int. Edit. 2009, 48, 8298–8302. [Google Scholar] [CrossRef] [PubMed]
  152. Nakanishi, R.; Kitaura, R.; Ayala, P.; Shiozawa, H.; De Blauwe, K.; Hoffmann, P.; Choi, D.; Miyata, Y.; Pichler, T.; Shinohara, H. Electronic structure of Eu atomic wires encapsulated inside single-wall carbon nanotubes. Phys. Rev. B 2012, 86, 115445. [Google Scholar] [CrossRef]
  153. Ayala, P.; Kitaura, R.; Nakanishi, R.; Shiozawa, H.; Ogawa, D.; Hoffmann, P.; Shinohara, H.; Pichler, T. Templating rare-earth hybridization via ultrahigh vacuum annealing of ErCl3 nanowires inside carbon nanotubes. Phys. Rev. B 2011, 83, 085407. [Google Scholar] [CrossRef]
  154. Zakalyukin, R.M.; Mavrin, B.N.; Dem’yanets, L.N.; Kiselev, N.A. Synthesis and characterization of single-walled carbon nanotubes filled with the superionic material SnF2. Carbon 2008, 46, 1574–1578. [Google Scholar] [CrossRef]
  155. Eliseev, A.A.; Yashina, L.V.; Brzhezinskaya, M.M.; Chernysheva, M.V.; Kharlamova, M.V.; Verbitsky, N.I.; Lukashin, A.V.; Kiselev, N.A.; Kumskov, A.S.; Zakalyuhin, R.M.; et al. Structure and electronic properties of AgX (X = Cl, Br, I)-intercalated single-walled carbon nanotubes. Carbon 2010, 48, 2708–2721. [Google Scholar] [CrossRef]
  156. Eliseev, A.A.; Yashina, L.V.; Verbitskiy, N.I.; Brzhezinskaya, M.M.; Kharlamova, M.V.; Chernysheva, M.V.; Lukashin, A.V.; Kiselev, N.A.; Kumskov, A.S.; Freitag, B.; et al. Interaction between single walled carbon nanotube and 1D crystal in CuX@SWCNT (X = Cl, Br, I) nanostructures. Carbon 2012, 50, 4021–4039. [Google Scholar] [CrossRef]
  157. Flahaut, E.; Sloan, J.; Coleman, K.; Green, M. Synthesis of 1D P-block halide crystals within single walled carbon nanotubes. AIP Conf. Proc. 2001, 591, 283–286. [Google Scholar]
  158. Monthioux, M.; Flahaut, E.; Cleuziou, J.P. Hybrid carbon nanotubes: Strategy, progress, and perspectives. J. Mater. Res. 2006, 21, 2774–2793. [Google Scholar] [CrossRef]
  159. Sloan, J.; Kirkland, A.I.; Hutchison, J.L.; Green, M.L.H. Integral atomic layer architectures of 1D crystals inserted into single walled carbon nanotubes. Chem. Commun. 2002, 1319–1332. [Google Scholar] [CrossRef]
  160. Eremina, V.A.; Fedotov, P.V.; Obraztsova, E.D. Copper chloride functionalization of semiconducting and metallic fractions of single-walled carbon nanotubes. J. Nanophotonics 2015, 10, 012515. [Google Scholar] [CrossRef]
  161. Fedotov, P.V.; Tonkikh, A.A.; Obraztsova, E.A.; Nasibulin, A.G.; Kauppinen, E.I.; Chuvilin, A.L.; Obraztsova, E.D. Optical properties of single-walled carbon nanotubes filled with CuCl by gas-phase technique. Phys. Status Solidi (b) 2014, 251, 2466–2470. [Google Scholar] [CrossRef]
  162. Fedotov, P.V.; Eremina, V.A.; Tonkikh, A.A.; Chernov, A.I.; Obraztsova, E.D. Enhanced optical transparency of films formed from sorted metallic or semiconducting single-walled carbon nanotubes filled with CuCl. Phys. Status Solidi (b) 2016, 253, 2400–2405. [Google Scholar] [CrossRef]
  163. Kharlamova, M.V.; Kramberger, C.; Mittelberger, A.; Yanagi, K.; Pichler, T.; Eder, D. Silver Chloride Encapsulation-Induced Modifications of Raman Modes of Metallicity-Sorted Semiconducting Single-Walled Carbon Nanotubes. Spectrosc. 2018, 2018, 1–9. [Google Scholar] [CrossRef]
  164. Kharlamova, M.V.; Kramberger, C.; Domanov, O.; Mittelberger, A.; Yanagi, K.; Pichler, T.; Eder, D. Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver chloride. J. Mater. Sci. 2018, 53, 13018–13029. [Google Scholar] [CrossRef]
  165. Kharlamova, M.V.; Kramberger, C.; Domanov, O.; Mittelberger, A.; Saito, T.; Yanagi, K.; Pichler, T.; Eder, D. Comparison of Doping Levels of Single-Walled Carbon Nanotubes Synthesized by Arc-Discharge and Chemical Vapor Deposition Methods by Encapsulated Silver Chloride. Phys. Status Solidi (b) 2018, 255, 1800178. [Google Scholar] [CrossRef]
  166. Kharlamova, M.V. Comparison of influence of incorporated 3d-, 4d- and 4f metal chlorides on electronic properties of single-walled carbon nanotubes. Appl. Phys. A-Mer. 2013; in press. [Google Scholar]
  167. Kharlamova, M.V.; Yashina, L.V.; Eliseev, A.A.; Volykhov, A.A.; Neudachina, V.S.; Brzhezinskaya, M.M.; Zyubina, T.S.; Lukashin, A.V.; Tretyakov, Y.D. Single-walled carbon nanotubes filled with nickel halogenides: Atomic structure and doping effect. Phys. Status Solidi (b) 2012, 249, 2328–2332. [Google Scholar] [CrossRef]
  168. Kharlamova, M.V.; Eliseev, A.A.; Yashina, L.V.; Lukashin, A.V.; Tretyakov, Y.D. Synthesis of nanocomposites on basis of single-walled carbon nanotubes intercalated by manganese halogenides. J. Phys. Conf. Ser. 2012, 345, 012034. [Google Scholar] [CrossRef]
  169. Kharlamova, M.V.; Yashina, L.V.; Volykhov, A.A.; Niu, J.J.; Neudachina, V.S.; Brzhezinskaya, M.M.; Zyubina, T.S.; Belogorokhov, A.I.; Eliseev, A.A. Acceptor doping of single-walled carbon nanotubes by encapsulation of zinc halogenides. Eur. Phys. J. B 2012, 85, 34. [Google Scholar] [CrossRef]
  170. Kharlamova, M.V.; Brzhezinskaya, M.; Vinogradov, A.; Suzdalev, I.; Maksimov, Y.V.; Imshennik, V.; Novichikhin, S.V.; Krestinin, A.V.; Yashina, L.V.; Lukashin, A.V.; et al. The forming and properties of one-dimensional FeHaI 2 (HaI=Cl, Br, I) nanocrystals in channels of single-walled carbon nanotubes. Rus. Nanotechnol. 2009, 4, 77–8787. [Google Scholar]
  171. Sloan, J.; Friedrichs, S.; Flahaut, E.; Brown, G.; Bailey, S.R.; Coleman, K.S.; Xu, C.; Green, M.L.H.; Hutchison, J.L.; Kirkland, A.I.; et al. The characterisation of sub-nanometer scale structures within single walled carbon nanotubes. Am. Inst. Phys. 2001, 277–282. [Google Scholar]
  172. Fedoseeva, Y.V.; Orekhov, A.S.; Chekhova, G.N.; Koroteev, V.O.; Kanygin, M.A.; Seovskiy, B.V.; Chuvilin, A.; Pontiroli, D.; Ricco, M.; Bulusheva, L.G.; et al. Single-Walled Carbon Nanotube Reactor for Redox Transformation of Mercury Dichloride. Acs Nano 2017, 11, 8643–8649. [Google Scholar] [CrossRef] [PubMed]
  173. Kharlamova, M.V.; Yashina, L.V.; Lukashin, A.V. Charge transfer in single-walled carbon nanotubes filled with cadmium halogenides. J. Mater. Sci. 2013, 48, 8412–8419. [Google Scholar] [CrossRef]
  174. Kharlamova, M.V. Nanoscomposites on Basis of Carbon Nnaotubes: Synthsis, and Modification of the Electronic Properties. Ph.D. Thesis, Lomonosov Moscow State University, Moscow, Russia, 2013. [Google Scholar]
  175. Kharlamova, M.V. Electronic properties of single-walled carbon nanotubes filled with manganese halogenides. Appl. Phys. A 2016, 122, 791. [Google Scholar] [CrossRef]
  176. Kharlamova, M.V.; Kramberger, C.; Pichler, T. Semiconducting response in single-walled carbon nanotubes filled with cadmium chloride. Phys. Status Solidi (b) 2016, 253, 2433–2439. [Google Scholar] [CrossRef]
  177. Kharlamova, M.V.; Kramberger, C.; Rudatis, P.; Pichler, T.; Eder, D. Revealing the doping effect of encapsulated lead halogenides on single-walled carbon nanotubes. Appl. Phys. A 2019, 125, 320. [Google Scholar] [CrossRef]
  178. Kitaura, R.; Ogawa, D.; Kobayashi, K.; Saito, T.; Ohshima, S.; Nakamura, T.; Yoshikawa, H.; Awaga, K.; Shinohara, H. High Yield Synthesis and Characterization of the Structural and Magnetic Properties of Crystalline ErCl3 Nanowires in Single-Walled Carbon Nanotube Templates. Nano Res. 2008, 1, 152–157. [Google Scholar] [CrossRef] [Green Version]
  179. Satishkumar, B.C.; Taubert, A.; Luzzi, D.E. Filling single-wall carbon nanotubes with d- and f-metal chloride and metal nanowires. J. Nanosci. Nanotechnol. 2003, 3, 159–163. [Google Scholar] [CrossRef]
  180. Xu, C.G.; Sloan, J.; Brown, G.; Bailey, S.; Williams, V.C.; Friedrichs, S.; Coleman, K.S.; Flahaut, E.; Hutchison, J.L.; Dunin-Borkowski, R.E.; et al. 1D lanthanide halide crystals inserted into single-walled carbon nanotubes. Chem. Commun. 2000, 2427–2428. [Google Scholar] [CrossRef]
  181. Kharlamova, M.V. Rare-earth metal halogenide encapsulation-induced modifications in Raman spectra of single-walled carbon nanotubes. Appl. Phys. A 2014, 118, 27–35. [Google Scholar] [CrossRef]
  182. Kharlamova, M.V.; Volykhov, A.A.; Yashina, L.V.; Egorov, A.V.; Lukashin, A.V. Experimental and theoretical studies on the electronic properties of praseodymium chloride-filled single-walled carbon nanotubes. J. Mater. Sci. 2015, 50, 5419–5430. [Google Scholar] [CrossRef]
  183. Kharlamova, M.V.; Kramberger, C.; Mittelberger, A. Raman spectroscopy study of the doping effect of the encapsulated terbium halogenides on single-walled carbon nanotubes. Appl. Phys. A 2017, 123, 239. [Google Scholar] [CrossRef]
  184. Santidrian, A.; Kierkowicz, M.; Pach, E.; Darvasiova, D.; Ballesteros, B.; Tobias, G.; Kalbac, M. Charge transfer in steam purified arc discharge single walled carbon nanotubes filled with lutetium halides. Phys. Chem. Chem. Phys. 2020, 22, 10063–10075. [Google Scholar] [CrossRef]
  185. Brown, G.; Bailey, S.R.; Sloan, J.; Xu, C.G.; Friedrichs, S.; Flahaut, E.; Coleman, K.S.; Hutchison, J.L.; Dunin-Borkowski, R.E.; Green, M.L.H. Electron beam induced in situ clusterisation of 1D ZrCl4 chains within single-walled carbon nanotubes. Chem. Commun. 2001, 845–846. [Google Scholar] [CrossRef]
  186. Brown, G.; Bailey, S.R.; Novotny, M.; Carter, R.; Flahaut, E.; Coleman, K.S.; Hutchison, J.L.; Green, M.L.H.; Sloan, J. High yield incorporation and washing properties of halides incorporated into single walled carbon nanotubes. Appl. Phys. A 2003, 76, 457–462. [Google Scholar] [CrossRef]
  187. Kirkland, A.I.; Meyer, M.R.; Sloan, J.; Hutchison, J.L. Structure determination of atomically controlled crystal architectures grown within single wall carbon nanotubes. Microsc. Microanal. 2005, 11, 401–409. [Google Scholar] [CrossRef]
  188. Sloan, J.; Friedrichs, S.; Meyer, R.R.; Kirkland, A.I.; Hutchison, J.L.; Green, M.L.H. Structural changes induced in nanocrystals of binary compounds confined within single walled carbon nanotubes: A brief review. Inorg. Chim. Acta. 2002, 330, 1–12. [Google Scholar] [CrossRef]
  189. Sloan, J.; Kirkland, A.I.; Hutchison, J.L.; Green, M.L.H. Aspects of crystal growth within carbon nanotubes. Comptes Rendus Phys. 2003, 4, 1063–1074. [Google Scholar] [CrossRef]
  190. Kharlamova, M.V.; Eliseev, A.A.; Yashina, L.V.; Petukhov, D.I.; Liu, C.P.; Wang, C.Y.; Semenenko, D.A.; Belogorokhov, A.I. Study of the electronic structure of single-walled carbon nanotubes filled with cobalt bromide. JETP Lett. 2010, 91, 196–200. [Google Scholar] [CrossRef]
  191. Kharlamova, M.V. Raman Spectroscopy Study of the Doping Effect of the Encapsulated Iron, Cobalt, and Nickel Bromides on Single-Walled Carbon Nanotubes. J. Spectrosc. 2015, 2015, 653848. [Google Scholar] [CrossRef] [Green Version]
  192. Bendall, J.S.; Ilie, A.; Welland, M.E.; Sloan, J.; Green, M.L.H. Thermal stability and reactivity of metal halide filled single-walled carbon nanotubes. J. Phys. Chem. B 2006, 110, 6569–6573. [Google Scholar] [CrossRef] [PubMed]
  193. Chernysheva, M.V.; Eliseev, A.A.; Lukashin, A.V.; Tretyakov, Y.D.; Savilov, S.V.; Kiselev, N.A.; Zhigalina, O.M.; Kumskov, A.S.; Krestinin, A.V.; Hutchison, J.L. Filling of single-walled carbon nanotubes by Cul nanocrystals via capillary technique. Physica E 2007, 37, 62–65. [Google Scholar] [CrossRef]
  194. Hutchison, J.L.; Sloan, J.; Kirkland, A.I.; Green, M.L.H.; Green, M.L.H. Growing and characterizing one-dimensional crystals within single-walled carbon nanotubes. J. Electron Microsc. 2004, 53, 101–106. [Google Scholar] [CrossRef]
  195. Kiselev, N.A.; Zakalyukin, R.M.; Zhigalina, O.M.; Grobert, N.; Kumskov, A.S.; Grigoriev, Y.V.; Chernysheva, M.V.; Eliseev, A.A.; Krestinin, A.V.; Tretyakov, Y.D.; et al. The structure of 1D CuI crystals inside SWNTs. J. Microsc. 2008, 232, 335–342. [Google Scholar] [CrossRef]
  196. Kiselev, N.A.; Kumskov, A.S.; Zakalyukin, R.M.; Vasiliev, A.L.; Chernisheva, M.V.; Eliseev, A.A.; Krestinin, A.V.; Freitag, B.; Hutchison, J.L. The structure of nanocomposite 1D cationic conductor crystal@SWNT. J. Microsc. 2012, 246, 309–321. [Google Scholar] [CrossRef]
  197. Kumskov, A.S.; Zhigalina, V.G.; Chuvilin, A.L.; Verbitskiy, N.I.; Ryabenko, A.G.; Zaytsev, D.D.; Eliseev, A.A.; Kiselev, N.A. The structure of 1D and 3D CuI nanocrystals grown within 1.5-2.5 nm single wall carbon nanotubes obtained by catalyzed chemical vapor deposition. Carbon 2012, 50, 4696–4704. [Google Scholar] [CrossRef]
  198. Meyer, R.R.; Sloan, J.; Dunin-Borkowski, R.E.; Kirkland, A.I.; Novotny, M.C.; Bailey, S.R.; Hutchison, J.L.; Green, M.L.H. Discrete atom imaging of one-dimensional crystals formed within single-walled carbon nanotubes. Science 2000, 289, 1324–1326. [Google Scholar] [CrossRef] [Green Version]
  199. Sloan, J.; Novotny, M.C.; Bailey, S.R.; Brown, G.; Xu, C.; Williams, V.C.; Friedrichs, S.; Flahaut, E.; Callender, R.L.; York, A.P.E.; et al. Two layer 4:4 co-ordinated KI crystals grown within single walled carbon nanotubes. Chem. Phys. Lett. 2000, 329, 61–65. [Google Scholar] [CrossRef]
  200. Kharlamova, M.V.; Kramberger, C.; Rudatis, P.; Yanagi, K.; Eder, D. Characterization of the Electronic Properties of Single-Walled Carbon Nanotubes Filled with an Electron Donor-Rubidium Iodide: Multifrequency Raman and X-ray Photoelectron Spectroscopy Studies. Phys. Status Solidi (b) 2019, 256, 1900209. [Google Scholar] [CrossRef]
  201. Flahaut, E.; Sloan, J.; Friedrichs, S.; Kirkland, A.I.; Coleman, K.S.; Williams, V.C.; Hanson, N.; Hutchison, J.L.; Green, M.L.H. Crystallization of 2H and 4H PbI2 in carbon nanotubes of varying diameters and morphologies. Chem. Mater. 2006, 18, 2059–2069. [Google Scholar] [CrossRef]
  202. Philp, E.; Sloan, J.; Kirkland, A.I.; Meyer, R.R.; Friedrichs, S.; Hutchison, J.L.; Green, M.L.H. An encapsulated helical one-dimensional cobalt iodide nanostructure. Nat. Mater. 2003, 2, 788–791. [Google Scholar] [CrossRef]
  203. Sloan, J.; Grosvenor, S.J.; Friedrichs, S.; Kirkland, A.I.; Hutchison, J.L.; Green, M.L.H. A one-dimensional BaI2 chain with five- and six-coordination, formed within a single-walled carbon nanotube. Aew. Chem. Int. Edit. 2002, 41, 1156. [Google Scholar] [CrossRef]
  204. Friedrichs, S.; Falke, U.; Green, M.L.H. Phase separation of Lal3 inside single-walled carbon nanotubes. Chemphyschem 2005, 6, 300–305. [Google Scholar] [CrossRef]
  205. Friedrichs, S.; Kirkland, A.I.; Meyer, R.R.; Sloan, J.; Green, M.L.H. LaI2@(18,3)SWNT: The unprecedented structure of a LaI2 "Crystal," encapsulated within a single-walled carbon nanotube. Microsc. Microanal. 2005, 11, 421–430. [Google Scholar] [CrossRef]
  206. Sloan, J.; Terrones, M.; Nufer, S.; Friedrichs, S.; Bailey, S.R.; Woo, H.G.; Ruhle, M.; Hutchison, J.L.; Green, M.L.H. Metastable one-dimensional AgCl1-xIx solid-solution wurzite "tunnel" crystals formed within single-walled carbon nanotubes. J. Am. Chem. Soc. 2002, 124, 2116–2117. [Google Scholar] [CrossRef]
  207. Falaleev, N.S.; Kumskov, A.S.; Zhigalina, V.G.; Verbitskiy, I.I.; Vasiliev, A.L.; Makarova, A.A.; Vyalikh, D.V.; Kiselev, N.A.; Eliseev, A.A. Capsulate structure effect on SWNTs doping in RbxAg1-xI@SWNT composites. Crystengcomm 2017, 19, 3063–3070. [Google Scholar] [CrossRef] [Green Version]
  208. Kharlamova, M.V. Comparative analysis of electronic properties of tin, gallium, and bismuth chalcogenide-filled single-walled carbon nanotubes. J. Mater. Sci. 2014, 49, 8402–8411. [Google Scholar] [CrossRef]
  209. Eliseev, A.A.; Chernysheva, M.V.; Verbitskii, N.I.; Kiseleva, E.A.; Lukashin, A.V.; Tretyakov, Y.D.; Kiselev, N.A.; Zhigalina, O.M.; Zakalyukin, R.M.; Vasiliev, A.L.; et al. Chemical Reactions within Single-Walled Carbon Nanotube Channels. Chem. Mater. 2009, 21, 5001–5003. [Google Scholar] [CrossRef]
  210. Wang, Z.Y.; Li, H.; Liu, Z.; Shi, Z.J.; Lu, J.; Suenaga, K.; Joung, S.K.; Okazaki, T.; Gu, Z.N.; Zhou, J.; et al. Mixed Low-Dimensional Nanomaterial: 2D Ultranarrow MoS2 Inorganic Nanoribbons Encapsulated in Quasi-1D Carbon Nanotubes. J. Am. Chem. Soc. 2010, 132, 13840–13847. [Google Scholar] [CrossRef] [PubMed]
  211. Kharlamova, M.V.; Yashina, L.V.; Lukashin, A.V. Comparison of modification of electronic properties of single-walled carbon nanotubes filled with metal halogenide, chalcogenide, and pure metal. Appl. Phys. A-Mer. 2013, 112, 297–304. [Google Scholar] [CrossRef]
  212. Kharlamova, M.V. Novel approach to tailoring the electronic properties of single-walled carbon nanotubes by the encapsulation of high-melting gallium selenide using a single-step process. JETP Lett. 2013, 98, 272–277. [Google Scholar] [CrossRef]
  213. Carter, R.; Sloan, J.; Kirkland, A.I.; Meyer, R.R.; Lindan, P.J.D.; Lin, G.; Green, M.L.H.; Vlandas, A.; Hutchison, J.L.; Harding, J. Correlation of structural and electronic properties in a new low-dimensional form of mercury telluride. Phys. Rev. Lett. 2006, 96, 215501. [Google Scholar] [CrossRef]
  214. Sloan, J.; Carter, R.; Meyer, R.R.; Vlandas, A.; Kirkland, A.I.; Lindan, P.J.D.; Lin, G.; Harding, J.; Hutchison, J.L. Structural correlation of band-gap modifications induced in mercury telluride by dimensional constraint in single walled carbon nanotubes. Phys. Status Solidi (b) 2006, 243, 3257–3262. [Google Scholar] [CrossRef]
  215. Monthioux, M. Introduction to the Meta-Nanotube Book. In Carbon Meta-Nanotubes: Synthesis, Properties, and Applications; John Wiley & Sons Ltd.: New York, NY, USA, 2012; pp. 1–8. [Google Scholar]
  216. Sloan, J.; Monthioux, M. Filled Carbon Nanotubes: (X@CNTs). In Carbon Meta-Nanotubes: Synthesis, Properties, and Applications; John Wiley & Sons Ltd.: New York, NY, USA, 2012; pp. 225–272. [Google Scholar]
  217. Simon, F.; Monthioux, M. Fullerenes inside Carbon Nanotubes: The Peapods. In Carbon Meta-Nanotubes: Synthesis, Properties, and Applications; John Wiley & Sons Ltd.: New York, NY, USA, 2012; pp. 273–322. [Google Scholar]
  218. Pfeiffer, R.; Holzweber, M.; Peterlik, H.; Kuzmany, H.; Liu, Z.; Suenaga, K.; Kataura, H. Dynamics of Carbon Nanotube Growth from Fullerenes. Nano Lett. 2007, 7, 2428–2434. [Google Scholar] [CrossRef]
  219. Kharlamova, M.V. Investigation of growth dynamics of carbon nanotubes. Beilstein J. Nanotechnol. 2017, 8, 826–856. [Google Scholar] [CrossRef]
  220. Kharlamova, M.V.; Kramberger, C. Metal Cluster Size-Dependent Activation Energies of Growth of Single-Chirality Single-Walled Carbon Nanotubes inside Metallocene-Filled Single-Walled Carbon Nanotubes. Nanomaterials 2021, 11, 2649. [Google Scholar] [CrossRef]
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Figure 1. Applications of filled SWCNTs.
Figure 1. Applications of filled SWCNTs.
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Figure 2. The schematics of filling of SWCNTs with metal halogenides, metal chalcogenides, metals, metallocenes, and investigation of growth properties, chemical properties and electronic properties.
Figure 2. The schematics of filling of SWCNTs with metal halogenides, metal chalcogenides, metals, metallocenes, and investigation of growth properties, chemical properties and electronic properties.
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Figure 3. The Raman spectra of cobaltocene-filled SWCNTs annealed at temperature of 580 °C for 2–4168 min, acquired at laser wavelength of 633 nm (a) and 568 nm (b). Reprinted from M. V. Kharlamova et al. Chiral vector and metal catalyst-dependent growth kinetics of single-wall carbon nanotubes, Carbon, 2018, V. 133, pp. 283–292, Copyright 2018, with permission from Elsevier [11].
Figure 3. The Raman spectra of cobaltocene-filled SWCNTs annealed at temperature of 580 °C for 2–4168 min, acquired at laser wavelength of 633 nm (a) and 568 nm (b). Reprinted from M. V. Kharlamova et al. Chiral vector and metal catalyst-dependent growth kinetics of single-wall carbon nanotubes, Carbon, 2018, V. 133, pp. 283–292, Copyright 2018, with permission from Elsevier [11].
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Figure 4. The dependence of activation energy Eα (a) and Eβ (b) of growth of inner nanotubes on their diameter. Reproduced from [215]. Copyright 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
Figure 4. The dependence of activation energy Eα (a) and Eβ (b) of growth of inner nanotubes on their diameter. Reproduced from [215]. Copyright 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
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Figure 5. The schematic of metal halogenide-filling and investigation of SWCNTs.
Figure 5. The schematic of metal halogenide-filling and investigation of SWCNTs.
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Figure 6. The OAS spectra of the pristine, and GaSe filled SWCNTs. The peaks are denoted. Reprinted from Kharlamova M.V. Novel approach to tailoring the electronic properties of single-walled carbon nanotubes by the encapsulation of high-melting gallium selenide using a single-step process. JETP Letters. V.98. N.5. P.272–277, 2013, Springer Nature [212].
Figure 6. The OAS spectra of the pristine, and GaSe filled SWCNTs. The peaks are denoted. Reprinted from Kharlamova M.V. Novel approach to tailoring the electronic properties of single-walled carbon nanotubes by the encapsulation of high-melting gallium selenide using a single-step process. JETP Letters. V.98. N.5. P.272–277, 2013, Springer Nature [212].
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Figure 7. The Raman spectra of the pristine SWCNTs, and PbCl2—filled SWCNTs acquired at different laser excitation wavelengths. Reprinted from Kharlamova M.V., Kramberger C., Rudatis P., Pichler T., Eder D. Revealing the doping effect of encapsulated lead halogenides on single-walled carbon nanotubes. Appl. Phys. A. 2019. V.125. N.5. article number 320, Springer Nature [177].
Figure 7. The Raman spectra of the pristine SWCNTs, and PbCl2—filled SWCNTs acquired at different laser excitation wavelengths. Reprinted from Kharlamova M.V., Kramberger C., Rudatis P., Pichler T., Eder D. Revealing the doping effect of encapsulated lead halogenides on single-walled carbon nanotubes. Appl. Phys. A. 2019. V.125. N.5. article number 320, Springer Nature [177].
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Figure 8. The C 1s XPS spectra of the pristine, and MnCl2, MnBr2 filled SWCNTs. The inset shows the shift in the peak. Reprinted from Kharlamova M.V. Electronic properties of single-walled carbon nanotubes filled with manganese halogenides. Appl. Phys. A. 2016. V.122. N.9. article number 791, Springer Nature [175].
Figure 8. The C 1s XPS spectra of the pristine, and MnCl2, MnBr2 filled SWCNTs. The inset shows the shift in the peak. Reprinted from Kharlamova M.V. Electronic properties of single-walled carbon nanotubes filled with manganese halogenides. Appl. Phys. A. 2016. V.122. N.9. article number 791, Springer Nature [175].
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Figure 9. The NEXAFS spectra of the pristine and GaSe filled SWCNTs. Features of the spectra are denoted. The inset shows the π*-peak. Reprinted from Kharlamova M.V. Novel approach to tailoring the electronic properties of single-walled carbon nanotubes by the encapsulation of high-melting gallium selenide using a single-step process. JETP Letters. V.98. N.5. P.272–277, 2013, Springer Nature [212].
Figure 9. The NEXAFS spectra of the pristine and GaSe filled SWCNTs. Features of the spectra are denoted. The inset shows the π*-peak. Reprinted from Kharlamova M.V. Novel approach to tailoring the electronic properties of single-walled carbon nanotubes by the encapsulation of high-melting gallium selenide using a single-step process. JETP Letters. V.98. N.5. P.272–277, 2013, Springer Nature [212].
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Figure 10. (a) The RBM and G-bands of Raman spectra of the pristine and silver (I) chloride-filled semiconducting SWCNTs acquired at a laser wavelength of 514 nm fitted with individual components. The RBM-band is fitted with the components belonging to the nanotubes of different diameters. The G-band is fitted with G−LO, G+TO and G+LO components [163]. Copyright 2018 M. V. Kharlamova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (b) The C 1s XPS spectra of the pristine and silver (I) chloride-filled metallic SWCNTs. The inset zooms in the shift in the C 1s peak, as shown by the arrow. The dashed vertical lines denote the peak positions. Reproduced from Kharlamova M.V. et al. Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver (I) chloride. Journal of Materials Science. V.53. N.18. P.13,018–13,029. 2018, Springer Nature [164]. (c) The valence band spectra of the pristine and silver (I) chloride-filled metallic SWCNTs. The dashed vertical lines denote the positions of the π-peak. The shift in the π-peak is indicated by the arrow. The peak labeled M1 corresponds to the first Van Hove singularity of the pristine metallic SWCNTs. The Fermi level (EF) is indicated. Reproduced from Kharlamova M.V. et al. Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver (I) chloride. Journal of Materials Science. V.53. N.18. P.13,018–13,029. 2018, Springer Nature [164].
Figure 10. (a) The RBM and G-bands of Raman spectra of the pristine and silver (I) chloride-filled semiconducting SWCNTs acquired at a laser wavelength of 514 nm fitted with individual components. The RBM-band is fitted with the components belonging to the nanotubes of different diameters. The G-band is fitted with G−LO, G+TO and G+LO components [163]. Copyright 2018 M. V. Kharlamova et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (b) The C 1s XPS spectra of the pristine and silver (I) chloride-filled metallic SWCNTs. The inset zooms in the shift in the C 1s peak, as shown by the arrow. The dashed vertical lines denote the peak positions. Reproduced from Kharlamova M.V. et al. Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver (I) chloride. Journal of Materials Science. V.53. N.18. P.13,018–13,029. 2018, Springer Nature [164]. (c) The valence band spectra of the pristine and silver (I) chloride-filled metallic SWCNTs. The dashed vertical lines denote the positions of the π-peak. The shift in the π-peak is indicated by the arrow. The peak labeled M1 corresponds to the first Van Hove singularity of the pristine metallic SWCNTs. The Fermi level (EF) is indicated. Reproduced from Kharlamova M.V. et al. Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver (I) chloride. Journal of Materials Science. V.53. N.18. P.13,018–13,029. 2018, Springer Nature [164].
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Figure 11. The results of the analysis of Raman spectra of the pristine SWCNTs and nanotubes filled with iron (II) bromide, cobalt (II) bromide and nickel (II) bromide. The comparison of the relative intensity in the RBM peaks (a), shifts of the G-band peaks and relative intensity of the G−LO peak (b) [191]. Copyright 2015 Marianna V. Kharlamova. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 11. The results of the analysis of Raman spectra of the pristine SWCNTs and nanotubes filled with iron (II) bromide, cobalt (II) bromide and nickel (II) bromide. The comparison of the relative intensity in the RBM peaks (a), shifts of the G-band peaks and relative intensity of the G−LO peak (b) [191]. Copyright 2015 Marianna V. Kharlamova. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Table
Table 1. The encapsulated inorganic compounds, diameter and conductivity types of the host SWCNTs, methods of the investigation of the electronic properties, types of doping and the observed Fermi level shifts of SWCNTs.
Table 1. The encapsulated inorganic compounds, diameter and conductivity types of the host SWCNTs, methods of the investigation of the electronic properties, types of doping and the observed Fermi level shifts of SWCNTs.
Encapsulated Metal HalogenideDiameter and Conductivity Type of SWCNTs aMethods of the Investigation of the Electronic Properties bType of DopingFermi Level Shift, eVReference
AgCl1.4 nm m-SWCNTRS, XPS, UPSp−0.36[164]
AgCl 1.4 nm s-SWCNTRSpn/a[163]
PrCl31.4 nm m-SWCNTOAS, RS, XAS, XPSp−0.42[182]
1.4 nm s-SWCNT−0.28
CuCl1.4 nm m-SWCNTOAS, RS (+ EC charging), XAS, XPS, WF, VBp−0.57[156]
1.4 nm s-SWCNT−0.37
CuBr1.4 nm m-SWCNTOAS, RS (+ EC charging), XAS, XPS, WF, VBp−0.60[156]
1.4 nm s-SWCNT−0.36
CuI1.4 nm m-SWCNTOAS, RS (+ EC charging), XAS, XPS, WF, VBp−0.35[156]
1.4 nm s-SWCNT−0.25
MnCl21.4 nm mix-SWCNTRS, XPSp−0.43[175]
MnBr21.4 nm mix-SWCNTRS, XPSp−0.37[175]
FeCl21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.30[170]
FeBr21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.30[170]
FeI21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.30[170]
CoBr21.4 nm mix-SWCNTOAS, RS, XPSp−0.38[190]
NiCl21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.58[167]
NiBr21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.29[167]
ZnCl21.4 nm mix-SWCNTOAS, RS, XASpn/a[169]
ZnBr21.4 nm mix-SWCNTOAS, RS, XAS, XPS, WF, VBp−0.28[169]
ZnI21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.25[169]
RbI1.4 nm mix-SWCNTRS, XPSn+0.20[200]
RbAg4I51.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.35[207]
AgCl1.4 nm mix-SWCNTOAS, RS (+ EC charging), XAS, XPS, UPSp−0.38[155]
AgBr1.4 nm mix-SWCNTOAS, RS (+ EC charging), XAS, XPS, UPSp−0.37[155]
AgI1.4 nm mix-SWCNTOAS, RS (+ EC charging), XAS, XPS, UPSp−0.30[155]
CdCl21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.36[173]
CdBr21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.36[173]
CdI21.4 nm mix-SWCNTOAS, RS, XAS, XPSp−0.39[173]
PbCl21.4 nm mix-SWCNTRS, XPSp−0.15[177]
PbBr21.4 nm mix-SWCNTRS, XPSp−0.07[177]
PbI21.4 nm mix-SWCNTsRS, XPSp−0.17[177]
TbCl31.4 nm mix-SWCNTsRSp [183]
TbBr31.4 nm mix-SWCNTsRSp [183]
TbI31.4 nm mix-SWCNTsRSp [183]
TmCl31.4 nm mix-SWCNTsRS p [211]
LuCl31.4 nm mix-SWCNTsRS (+ EC charging)p [184]
LuBr31.4 nm mix-SWCNTsRS (+ EC charging)p [184]
LuI31.4 nm mix-SWCNTsRS (+ EC charging)p [184]
HgCl21.7 nm mix-SWCNTXAS, XPSp−0.20[172]
a m-SWCNT = metallic SWCNTs, s-SWCNT = semiconducting SWCNTs, mix-SWCNT = metallicity-mixed SWCNTs; b OAS = optical absorption spectroscopy, RS (+ EC charging) = Raman spectroscopy (with electrochemical charging), XAS = X-ray absorption spectroscopy, XPS = X-ray photoelectron spectroscopy, UPS = ultraviolet photoelectron spectroscopy, WF = work function measurements, VB = valence band photoemission measurements.
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Kharlamova, M.V.; Kramberger, C. Phemenology of Filling, Investigation of Growth Kinetics and Electronic Properties for Applications of Filled Single-Walled Carbon Nanotubes. Nanomaterials 2023, 13, 314. https://0-doi-org.brum.beds.ac.uk/10.3390/nano13020314

AMA Style

Kharlamova MV, Kramberger C. Phemenology of Filling, Investigation of Growth Kinetics and Electronic Properties for Applications of Filled Single-Walled Carbon Nanotubes. Nanomaterials. 2023; 13(2):314. https://0-doi-org.brum.beds.ac.uk/10.3390/nano13020314

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Kharlamova, Marianna V., and Christian Kramberger. 2023. "Phemenology of Filling, Investigation of Growth Kinetics and Electronic Properties for Applications of Filled Single-Walled Carbon Nanotubes" Nanomaterials 13, no. 2: 314. https://0-doi-org.brum.beds.ac.uk/10.3390/nano13020314

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