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Article Dans Une Revue Nano Letters Année : 2011

Exprimental evidence of a mechanical coupling between layers in an individual double-walled carbon nanotubes

Dmitry Levshov
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Xuan Tinh Than
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Romain Parret
Matthieu Paillet
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Vincent Jourdain
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Ahmed Azmi Zahab
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Thierry Michel
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Jean-Louis Sauvajol
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Résumé

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 vibrationalmodes. 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.
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Dates et versions

hal-00654505 , version 1 (22-12-2011)

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Dmitry Levshov, Xuan Tinh Than, Raul Arenal, Valentin Popov, Romain Parret, et al.. Exprimental evidence of a mechanical coupling between layers in an individual double-walled carbon nanotubes. Nano Letters, 2011, 11, pp.4800. ⟨10.1021/nl2026234⟩. ⟨hal-00654505⟩
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