Effect of van der Waals Interactions on the Raman Modes in Single Walled Carbon Nanotubes

A. M. Rao, J. Chen, E. Richter, U. Schlecht, P. C. Eklund, R. C. Haddon, U. D. Venkateswaran, Y.-K. Kwon, and D. Tománek
Phys. Rev. Lett. 86, 3895 – Published 23 April 2001
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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 10cm1 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.

  • Received 26 July 2000

DOI:https://doi.org/10.1103/PhysRevLett.86.3895

©2001 American Physical Society

Authors & Affiliations

A. M. Rao1,*, J. Chen2,†, E. Richter2, U. Schlecht1, P. C. Eklund3, R. C. Haddon2, U. D. Venkateswaran4, Y.-K. Kwon5,‡, and D. Tománek5

  • 1Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634
  • 2Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506
  • 3Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802
  • 4Department of Physics, Oakland University, Rochester, Michigan 48309
  • 5Department of Physics and Astronomy and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824

  • *Author to whom correspondence should be addressed. Electronic address: arao@clemson.edu
  • Present address: Zyvex Corporation, Richardson, TX 75081.
  • Present address: Department of Physics, University of California–Berkeley, Berkeley, CA 94720.

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Vol. 86, Iss. 17 — 23 April 2001

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