Raman-active modes in finite and infinite double-walled carbon nanotubes

Rahmani, Abdelali; Sauvajol, Jean‐Louis; Cambedouzou, Julien; Benoît, C.

doi:10.1103/physrevb.71.125402

Cited by 42 publications

(50 citation statements)

References 24 publications

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“…In a first approximation, the TM profile can be fitted by using three Lorentzians. In agreement with recent calculations [18] be assigned to a mixing of the E modes of the inner tubes (the lowest frequency modes calculated in DWCNT [18]) and the E mode of the outer tubes (E 1 or E 2 modes as function of the chirality angle [19]). at 514.5 nm to 158 cm −1 at 633 nm [20]).…”

Section: Methodssupporting

confidence: 91%

“…Since RBMs of our DWCNT samples present large energy gap, in the following, we will assign, for simplicity, the different modes to specific inner or outer tubes. Our calculations [18] show that the frequencies of the RBM and TM of DWCNT significantly differ from those calculated for isolated single-walled carbon nanotubes (SWCNT). It was found for inner tubes with diameters in the range 0.6-2.2 nm, that the shift of the RBM in DWCNT with respect to its position as an isolated SWCNT depends linearly on the diameter.…”

Section: Methodsmentioning

confidence: 53%

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Raman spectroscopy of iodine-doped double-walled carbon nanotubes

et al. 2004

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We present a Raman spectroscopy study of iodine-intercalated (p-type doped) double-walled carbon nanotubes. Double-walled carbon nanotubes (DWCNTs) are synthesized by catalytic chemical vapor deposition (CCVD) and characterized by Raman spectroscopy. The assignment of the radial breathing modes and the tangential modes of pristine DWCNTs is done in the framework of the bond polarization theory, using the spectral moment method. The changes in the Raman spectrum upon iodine doping are analysed. Poly-iodine anions are identified, and the Raman spectra reveal that the charge transfer between iodine and DWCNTs only involves the outer tubes.

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Section: Methodssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 53%

Raman spectroscopy of iodine-doped double-walled carbon nanotubes

et al. 2004

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“…In this system, the existence of the intratube interactions causes the splitting of the observed Raman peaks, attributed to DWCNTs having the same secondary tube, but included in different diameter primary tubes [29,30]. The RBM frequencies of both inner and outer tubes are upshifted with decreasing interlayer distance (increasing intratube interaction) [29,31]. The simple picture concerning the optical properties of the DWCNTs becomes more complicated if we take into account the shift and broadening of the VHS due to the tube-tube interactions as well as the existence of excitonic states [32].…”

Section: Resultsmentioning

confidence: 99%

High pressure studies of the radial breathing modes in double‐wall carbon nanotubes

Arvanitidis

Christofilos

2006

Physica Status Solidi (b)

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This work focuses on the high pressure Raman study of the radial breathing modes (RBMs) of bundled double-wall carbon nanotubes (DWCNTs) using different excitation energies. The detailed examination of the Raman peaks attributed to the RBMs of the inner and outer tubes comprising the DWCNTs as a function of pressure provides a wealth of information concerning the pressure response of individual nanotubes as well as the inner-outer tube (intratube) interactions. The outer tube acts as a protection shield for the inner tube whereas the latter increase the structural stability of the externals upon pressure application. More importantly, the pressure response of the inner tubes, expressed by the normalized pressure slopes Γ i = (1/ω i ) (∂ω i /∂P) vs. frequency of their RBMs, shows a remarkable grouping in quasi-linear distributions wherein Γ i increases with ω. This behavior is explained by assuming that the pressure response of an internal tube is crucially dependent on the intratube spacing and thus the structural characteristics of the encapsulating tube.

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“…Many researches 2,3,4,5,6,7,8,9,10,11,12,13 have shown that there exists a kind of radial motion in the DWCNTs similar to the radial breathing modes (RBMs) in the SWCNTs, called as the radial breathing-like modes (RBLMs). But their relationship with the tube radii is still an open question, which is the most important for understanding the experimental RBLMs.…”

mentioning

confidence: 99%

“…But their relationship with the tube radii is still an open question, which is the most important for understanding the experimental RBLMs. In some publications 6,7,8,9,10,11,12 , the force constants are computed numerically, making the relationship between the RBLM frequencies and the tube radii unclear. Dobardžić et al suggested a simple analytical model 13 , considering the tube walls as coupled oscillators, and the FC values of the coupled oscillators are determined by a fitting to the experimental B 2g graphite phonon frequency of 127 cm −1 .…”

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confidence: 99%

Radial-breathing-like phonon modes of double-walled carbon nanotubes

Zhou

Dong

2005

Phys. Rev. B

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The radial-breathing-like phonon modes (RBLMs) of the double-walled carbon nanotubes are studied in a simple analytical model, in which the interaction force constants (FCs) can be obtained analytically from the continuous model. The RBLMs frequencies are obtained by solving the dynamical matrix, and their relationship with the tube radii can be obtained analytically, offering a powerful experimental tool for determining precisely the radii of the multi-walled carbon nanotubes.

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Raman-active modes in finite and infinite double-walled carbon nanotubes

Cited by 42 publications

References 24 publications

Raman spectroscopy of iodine-doped double-walled carbon nanotubes

Raman spectroscopy of iodine-doped double-walled carbon nanotubes

High pressure studies of the radial breathing modes in double‐wall carbon nanotubes

Radial-breathing-like phonon modes of double-walled carbon nanotubes

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