Effects of gas adsorption and collisions on electrical transport in single-walled carbon nanotubes

Citation
Gu. Sumanasekera et al., Effects of gas adsorption and collisions on electrical transport in single-walled carbon nanotubes, PHYS REV L, 85(5), 2000, pp. 1096-1099
Citations number
17
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
5
Year of publication
2000
Pages
1096 - 1099
Database
ISI
SICI code
0031-9007(20000731)85:5<1096:EOGAAC>2.0.ZU;2-7
Abstract
Degassing of bundles of single-walled carbon nanotubes in vacuum at 500 K i s found to drive the thermoelectricpower (TEP) strongly negative, indicatin g that the degassed metallic tubes in a bundle are n type. The magnitude of the negative TEP indicates that important asymmetry in the electronic carb on pi bands exists near the Fermi energy. Easily measurable increases in th e TEP (similar to 5-19 mu V/K) and resistivity (2%-10%) are observed at 500 K upon exposure to N-2 and He, suggesting that even gas collisions with th e nanotube wall can contribute significantly to the transport properties.