Phonon density of states of single-wall carbon nanotubes
The vibrational density of states of single-wall carbon nanotubes (SWNT) was obtained from inelastic neutron scattering data from 0 to 225 meV. The spectrum is similar to that of graphite above 40 meV, while intratube features are clearly observed at 22 and 36 meV. An unusual energy dependence below 10 meV is assigned to contributions from intertube modes in the 2D triangular lattice of SWNT bundles, and from intertube coupling to intratube excitations. Good agreement between experiment and a calculated density of states for the SWNT lattice is found over the entire energy range.
Rols
S
Groupe de Dynamique des Phases Condensees (UMR CNRS 5581), Universite Montpellier II, 34095 Montpellier Cedex 5, France and Institut Laue-Langevin, 38042 Grenoble Cedex, France.
Benes
Z
Anglaret
E
Sauvajol
JL
Papanek
P
Fischer
JE
Coddens
G
Schober
H
Dianoux
AJ