Thermoelectric power and thermal conductivity of single-walled carbon nanotubes
- Department of Physics, University of California, Berkeley, and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
We have measured the temperature-dependent thermopower (TEP) and thermal conductivity ({kappa}) of bulk samples of single-walled nanotube (SWNT) bundles. The TEP of SWNT{close_quote}s approaches zero as T{r_arrow}0, indicating a metallic density of states at the Fermi level in spite of their non-metallic resistivity behavior. At moderate temperatures, the TEP is large and positive, while a single metallic tube should have electron-hole symmetry and thus a zero thermopower. The measured data can be fit using a model comprising hole-like metallic tubes and electron-like semiconducting tubes in parallel. The thermal conductivity of SWNT{close_quote}s is found to be large, and dominated by phonons at all temperatures. At low temperature, {kappa}(T) is linear. The data can be fit by a single-scattering-time model; the model confirms that the low-temperature linear behavior is due to the thermal conductivity of a single one-dimensional phonon subband, and that the phonon mean free path is of order 100 nm. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 292676
- Report Number(s):
- CONF-980379-; ISSN 0094-243X; TRN: 9826M0003
- Journal Information:
- AIP Conference Proceedings, Vol. 442, Issue 1; Conference: 12. international winterschool on electronic properties of novel materials - progress in molecular nanostructures, Kirchberg (Austria), Mar 1998; Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
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