Resonant Raman scattering of smallest single-walled carbon nanotubes

Tang, Zikang; Zhai, Jin; Feng, Ya; Hu, Xijun; Saito, Riichiro; Sheng, Ping

doi:10.1117/12.792651

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…13 One reason for the lack of the theoretical results is the lack of corresponding experiments. Even though single spe-cies of very narrow tubes, down to the 0.4 nm range, were grown in the channels of zeolite crystals, 14 the lack of a full set of extremely high curvature tubes prevented so far a check of the expected dramatic deviation of their electronic structure from the tight-binding results.…”

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confidence: 99%

Electronic Structure of Carbon Nanotubes with Ultrahigh Curvature

et al. 2010

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The electronic and the vibrational structure of carbon nanotubes with ultrahigh curvature was systematically studied by resonance Raman scattering, high-resolution transmission electron microscopy (HRTEM), molecular dynamics, and ab initio DFT calculations. The ultrahigh curvature tubes were grown inside commercial HiPco tubes after filling the latter with the small but carbon-rich molecule ferrocene. TEM showed partial filling of the outer tubes with inner tubes and mobility of the latter in the electron beam. The smallest analyzed tube was of (5,0) chirality and had a DFT determined diameter of 0.406 nm and a radial breathing mode frequency of 570 cm(-1). For all inner tubes which had transitions in the visible spectral range, transition energies and RBM frequencies were determined with a resonance width of only 45 meV. Experimentally determined transition energies revealed dramatic deviations up to several electronvolts compared to tight-binding calculations and a significant family spread of more than 2 eV but were in agreement with many electron contribution corrected extended tight-binding results and with results from DFT calculations.

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confidence: 99%

Electronic Structure of Carbon Nanotubes with Ultrahigh Curvature

et al. 2010

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“…In addition, previous reports have indicated that single-chirality (2,2) CNTs can be formed inside the channels of zeolite template, despite that such ultrasmall CNTs would decompose without confinement of template. 139 These results suggest that design and exploration of suitable templates or substrates that have very strong interactions with certain types of CNTs could also be an interesting approach to try besides catalyst engineering. Furthermore, the charge transfer from catalyst nanoparticles to the growing nanotube edge atoms was studied and found to play a role in enhancing the reactivity of growth edges by changing their frontier electron density, which implies that the growth active sites are strongly correlated with the structures of metal nanoparticles through charge transfer.…”

Section: Applications Of Chirality-pure Carbon Nanotubesmentioning

confidence: 99%

Chirality-Controlled Synthesis and Applications of Single-Wall Carbon Nanotubes

Liu

Wu²,

Gui³

et al. 2017

ACS Nano

187

155

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Preparation of chirality-defined single-wall carbon nanotubes (SWCNTs) is the top challenge in the nanotube field. In recent years, great progress has been made toward preparing single-chirality SWCNTs through both direct controlled synthesis and postsynthesis separation approaches. Accordingly, the uses of single-chirality-dominated SWCNTs for various applications have emerged as a new front in nanotube research. In this Review, we review recent progress made in the chirality-controlled synthesis of SWCNTs, including metal-catalyst-free SWCNT cloning by vapor-phase epitaxy elongation of purified single-chirality nanotube seeds, chirality-specific growth of SWCNTs on bimetallic solid alloy catalysts, chirality-controlled synthesis of SWCNTs using bottom-up synthetic strategy from carbonaceous molecular end-cap precursors, etc. Recent major progresses in postsynthesis separation of single-chirality SWCNT species, as well as methods for chirality characterization of SWCNTs, are also highlighted. Moreover, we discuss some examples where single-chirality SWCNTs have shown clear advantages over SWCNTs with broad chirality distributions. We hope this review could inspire more research on the chirality-controlled preparation of SWCNTs and equally important inspire the use of single-chirality SWCNT samples for more fundamental studies and practical applications.

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“…The Fermi level may be further tuned by application of pressure or electric gate voltages [12], and in addition the superconductivity of SWCNTs may be further tunable through the lateral tube-to-tube distances and bond lengths. However, the synthesis of high quality carbon nanotubes thinner than 4 Angstrom in diameter represents a challenge [13]. In addition, no theoretical model predicting the superconducting transition temperature T c of the SWCNTs accurately was reported so far, despite of numerous first principle calculations that have been reported for SWCNTs [14,15].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in ultra-thin carbon nanotubes and carbyne-nanotube composites: An ab-initio approach

Wong

Бунтов

Гусева

et al. 2017

Carbon

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Abstract:The superconductivity of the 4-angstrom single-walled carbon nanotubes (SWCNTs) was discovered more than a decade ago, and marked the breakthrough of finding superconductivity in pure elemental undoped carbon compounds. The van Hove singularities in the electronic density of states at the Fermi level in combination with a large Debye temperature of the SWCNTs are expected to cause an impressively large superconducting gap. We have developed an innovative computational algorithm specially tailored for the investigation of superconductivity in ultrathin SWCNTs. We predict the superconducting transition temperature of various thin carbon nanotubes resulting from electron-phonon coupling by an ab-initio method, taking into account the effect of radial pressure, symmetry, chirality (N,M) and bond lengths. By optimizing the geometry of the carbon nanotubes, a maximum T c of 60K is found. We also use our method to calculate the T c of a linear carbon chain embedded in the center of (5,0) SWCNTs. The strong curvature in the (5,0) carbon nanotubes in the presence of the inner carbon chain provides an alternative path to increase the T c of this carbon composite by a factor of 2.2 with respect to the empty (5,0) SWCNTs. Introduction:

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Resonant Raman scattering of smallest single-walled carbon nanotubes

Cited by 3 publications

References 19 publications

Electronic Structure of Carbon Nanotubes with Ultrahigh Curvature

Electronic Structure of Carbon Nanotubes with Ultrahigh Curvature

Chirality-Controlled Synthesis and Applications of Single-Wall Carbon Nanotubes

Superconductivity in ultra-thin carbon nanotubes and carbyne-nanotube composites: An ab-initio approach

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