Abstract
Degassing of bundles of single-walled carbon nanotubes in vacuum at 500 K is found to drive the thermoelectricpower (TEP) strongly negative, indicating that the degassed metallic tubes in a bundle are type. The magnitude of the negative TEP indicates that important asymmetry in the electronic carbon bands exists near the Fermi energy. Easily measurable increases in the TEP and resistivity ( ) are observed at 500 K upon exposure to and He, suggesting that even gas collisions with the nanotube wall can contribute significantly to the transport properties.
- Received 2 March 2000
DOI:https://doi.org/10.1103/PhysRevLett.85.1096
©2000 American Physical Society