期刊
NANO LETTERS
卷 11, 期 11, 页码 4800-4804出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl2026234
关键词
Double-walled carbon nanotubes; Raman spectroscopy; breathing-like modes; electron diffraction; transmission electron microscopy
类别
资金
- ANR Excitubes
- TRAIN2 network
- French Russian PICS [4818]
- University of Montpellier 2
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.
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