Thermoelectric power and thermal conductivity of single-walled carbon nanotubes

Journal Article · Sat Aug 01 04:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.56532· OSTI ID:292676

Hone, J; Ellwood, I; Whitney, M; Muno, M; Piskoti, C; Zettl, A ^[1]

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1. 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--
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 442; ISSN 0094-243X; ISSN APCPCS
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
ELECTRONIC STRUCTURE
PHONONS
TEMPERATURE DEPENDENCE
THERMAL CONDUCTIVITY
THERMOELECTRIC MATERIALS