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Proceedings Paper

Individual SWNT based thermoelectric power chemical sensors
Author(s): S. C. Desai; K. P. Hewaparakrama; G. U. Sumanasekera; A. H. Jayatissa
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Paper Abstract

Electrical properties of individual Single-Walled Carbon Nanotube/rope in the configurations of 2-probe resistance, field effect transistor (FET), and thermopower have been measured. It is shown that oxygen adsorption in SWNTs is indeed a physisorption process. The p-type behavior of SWNTs in the ambient is believed to be due to the Fermi level pinning at impurity states of O2- near the top of the valence band of the tube. Chemisorption processes involving ammonia and nitrous oxide have been explored by studying FET properties. The thermoelectric power of individual ropes of SWNTs is measured and related to the FET properties.

Paper Details

Date Published: 11 October 2007
PDF: 7 pages
Proc. SPIE 6768, Nanomaterials Synthesis, Interfacing, and Integrating in Devices, Circuits, and Systems II, 67680N (11 October 2007); doi: 10.1117/12.735331
Show Author Affiliations
S. C. Desai, Univ. of Louisville (United States)
K. P. Hewaparakrama, Univ. of Louisville (United States)
G. U. Sumanasekera, Univ. of Louisville (United States)
A. H. Jayatissa, Univ. of Toledo (United States)


Published in SPIE Proceedings Vol. 6768:
Nanomaterials Synthesis, Interfacing, and Integrating in Devices, Circuits, and Systems II
Nibir K. Dhar; Achyut K. Dutta; M. Saif Islam, Editor(s)

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