Two field-emission states of single-walled carbon nanotubes

Citation
R. Collazo et al., Two field-emission states of single-walled carbon nanotubes, APPL PHYS L, 78(14), 2001, pp. 2058-2060
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
78
Issue
14
Year of publication
2001
Pages
2058 - 2060
Database
ISI
SICI code
0003-6951(20010402)78:14<2058:TFSOSC>2.0.ZU;2-C
Abstract
Two field-emission states of single-walled carbon nanotubes have been ident ified according to their respective emission current levels. The state yiel ding increased emission current has been attributed to the presence of adso rbates on the nanotubes. It was realized that, by application of high elect ric fields inducing large emission currents, a transition between the two s tates could be induced. For the high current state, field-emitted electrons originated from states located 1 eV below the Fermi level, as was determin ed by field-emission energy distribution measurements. This suggested that adsorbates introduced a resonant state on the surface that enhanced the tun neling probability of the electrons. These states are removed when the nano tubes are cleaned by application of a large electric field, thus, decreasin g the field-emitted current. (C) 2001 American Institute of Physics.