Thermoelectric power of p-doped single-wall carbon nanotubes and the role of phonon drag.
We measured thermoelectric power S of bulk single-wall carbon nanotube materials p doped with acids. In contrast to oxygen-exposed or degassed samples, S is very small at the lowest temperatures, increases superlinearly above a characteristic and sample-dependent T, and then levels off. We attribute this unusual behavior to 1D phonon drag, in which the depression of the Fermi energy cuts off electron-phonon scattering at temperatures below a characteristic T0. This idea is supported by a model calculation in which the low temperature behavior of phonon drag is specifically related to the one-dimensional character of the electronic spectrum.
Vavro
J
J
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA.
Llaguno
M C
MC
Fischer
J E
JE
Ramesh
S
S
Saini
R K
RK
Ericson
L M
LM
Davis
V A
VA
Hauge
R H
RH
Pasquali
M
M
Smalley
R E
RE