PMID: 11329351May 1, 2001Paper

Effect of van der Waals interactions on the Raman modes in single walled carbon nanotubes

Physical Review Letters
A M RaoD Tománek

Abstract

We have measured the Raman spectrum of individual single walled carbon nanotubes in solution and compare it to that obtained from the same starting material where the tubes are present in ordered bundles or ropes. Interestingly, the radial mode frequencies for the tubes in solution are found to be approximately 10 cm (-1) higher than those observed for tubes in a rope, in apparent contradiction to lattice dynamics predictions. We suggest that there is no such contradiction, and propose that the upshift is due rather to a decreased energy spacing of the Van Hove singularities in isolated tubes over the spacings in a rope, thereby allowing the same laser excitation to excite different diameter tubes in these two samples.

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Citations

Jan 7, 2010·Analytical and Bioanalytical Chemistry·Kevin A WepasnickD Howard Fairbrother
Jul 11, 2006·The Journal of Chemical Physics·M J Longhurst, N Quirke
Dec 18, 2015·Journal of the American Chemical Society·Guanghui LiRobert C Haddon
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