Resonant Raman effect in single-wall carbon
nanotubes
M.A. Pimenta
Marucci
M.J. Matthews
P.C. Eklund
G. Dresselhaus
Dresselhaus
(
Institute of Technology,
A resonant Raman study of
single-wall carbon nanotubes (SWNT) using several laser lines between 0.94
and 3.05 eV is presented. A detailed lineshape analysis shows that the
bands associated with the nanotube radial breathing mode are composed of a
sum of individual peaks whose relative intensities depend strongly on
the laser energy, in agreement with prior work. On the other hand, the
shape of the Raman bands associated with the tangential C-C stretching
motions does not depend significantly on the laser energy for laser
excitation energies in the ranges 0.94!=1.59 eV and 2.41!=3.05 eV. However,
new C-C stretching modes are observed in the spectra collected using laser
excitations in the 1.9!=2.0 eV range. The new results are discussed in
terms of the difference between the 1D electronic density of states for
the semiconducting and metallic carbon nanotubes.
Order No.:
JA809-006 © 1998 MRS
Go to September 1998 Table of Contents
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