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Raman Scattering Study of Coalesced Single Walled Carbon Nanotubes

Published online by Cambridge University Press:  31 January 2011

S. L. Fang ,
A. M. Rao ,
P. C. Eklund ,
P. Nikolaev ,
A. G. Rinzler  and
R. E. Smalley
S. L. Fang
Affiliation:
Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
A. M. Rao
Affiliation:
Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
P. C. Eklund*
Affiliation:
Department of Physics and Astronomy and Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40506
P. Nikolaev
Affiliation:
Center for Nanoscale Science and Technology, Rice Quantum Institute, and Departments of Chemistry and Physics, Rice University, Houston, Texas 77251
A. G. Rinzler
Affiliation:
Center for Nanoscale Science and Technology, Rice Quantum Institute, and Departments of Chemistry and Physics, Rice University, Houston, Texas 77251
R. E. Smalley
Affiliation:
Center for Nanoscale Science and Technology, Rice Quantum Institute, and Departments of Chemistry and Physics, Rice University, Houston, Texas 77251
*
a)Address correspondence to this author.
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Abstract

High temperature heat treatment of single wall carbon nanotube bundles in flowing H2 was used to produce a significant fraction (∼40%) of diameter-doubled, or coalesced tubes with a mean diameter corresponding to that of ∼(20, 20) tubes. At three laser excitation wavelengths (514.5, 647, and 1064 nm), a reduction in the Raman scattering intensity of the strong radial and tangential modes was observed in the H2-treated sample, consistent with the reduced fraction of tubes in the sample after coalescence. However, using 488 nm excitation, little or no change is observed in the Raman spectrum after the H2 treatment, suggesting that this excitation wavelength couples only to chiral symmetry tubes. Using the 647 nm excitation, the effect of H2 treatment on the tangential band is quite unique, and a significant change in the shape of the tangential band was observed. Our lineshape analysis, and other results reported in this issue, suggest that this unique change of shape is due to lost scattering intensity from metallic tubes partially compensated by tangential mode scattering from the coalesced tubes. The normally prominent radial breathing mode band, which would be expected at ∼90 cm−1 for ∼(20, 20) tubes was not observed, indicating that these larger diameter tubes do not exhibit strong resonant scattering, at least at any of the wavelengths used in this study.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 9 , September 1998 , pp. 2405 - 2411
Copyright
Copyright © Materials Research Society 1998

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