Experimental Evidence of a Mechanical Coupling between Layers in an Individual Double-Walled Carbon Nanotube

We perform transmission electron microscopy, electron diffraction, and Raman scattering experiments on an individual suspended double-walled carbon nanotube (DWCNT). The first two techniques allow the unambiguous determination of the DWCNT structure: (12,8)@(16,14). However, the low-frequency featur...

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Bibliographic Details
Published in:Nano letters 2011-11, Vol.11 (11), p.4800-4804
Main Authors: Levshov, D, Than, T. X, Arenal, R, Popov, V. N, Parret, R, Paillet, M, Jourdain, V, Zahab, A. A, Michel, T, Yuzyuk, Yu. I, Sauvajol, J.-L
Format: Article
Language:English
Subjects:
Adhesiveness
Carbon nanotubes
Electron diffraction
Joining
Lasers
Materials Testing
Nanostructure
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotubes
Particle Size
Power law
Raman scattering
Raman spectra
Stress, Mechanical
Tensile Strength
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Summary:We perform transmission electron microscopy, electron diffraction, and Raman scattering experiments on an individual suspended double-walled carbon nanotube (DWCNT). The first two techniques allow the unambiguous determination of the DWCNT structure: (12,8)@(16,14). However, the low-frequency features in the Raman spectra cannot be connected to the derived layer diameters d by means of the 1/d power law, widely used for the diameter dependence of the radial-breathing mode of single-walled nanotubes. We discuss this disagreement in terms of mechanical coupling between the layers of the DWCNT, which results in collective vibrational modes. Theoretical predictions for the breathing-like modes of the DWCNT, originating from the radial-breathing modes of the layers, are in a very good agreement with the observed Raman spectra. Moreover, the mechanical coupling qualitatively explains the observation of Raman lines of breathing-like modes, whenever only one of the layers is in resonance with the laser energy.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl2026234