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11 October 2007 Individual SWNT based thermoelectric power chemical sensors
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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.
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S. C. Desai, K. P. Hewaparakrama, G. U. Sumanasekera, and A. H. Jayatissa "Individual SWNT based thermoelectric power chemical sensors", Proc. SPIE 6768, Nanomaterials Synthesis, Interfacing, and Integrating in Devices, Circuits, and Systems II, 67680N (11 October 2007);

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