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Single Walled Carbon Nanotubes (SWNTs) as a Gas Sensor

Published online by Cambridge University Press:  15 March 2011

Bhabendra K. Pradhan ,
Gamini U. Sumanasekera ,
Clement K. W. Adu ,
Hugo Romero  and
Peter C. Eklund
Bhabendra K. Pradhan
Affiliation:
Department of Physics, The Pennsylvania State University, 104 Davey Laboratory University Park, PA 16802-6300
Gamini U. Sumanasekera
Affiliation:
Department of Physics, The Pennsylvania State University, 104 Davey Laboratory University Park, PA 16802-6300
Clement K. W. Adu
Affiliation:
Department of Physics, The Pennsylvania State University, 104 Davey Laboratory University Park, PA 16802-6300
Hugo Romero
Affiliation:
Department of Physics, The Pennsylvania State University, 104 Davey Laboratory University Park, PA 16802-6300
Peter C. Eklund*
Affiliation:
Department of Physics, The Pennsylvania State University, 104 Davey Laboratory University Park, PA 16802-6300
*
Corresponding author, email: pce3@psu.edu, Phone: 814 865 5233, Fax: 814 865 9851
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Abstract

A thermoelectric “nano-nose” has been built from tangled bundles of single- walled carbon nanotubes (SWNT). The detector's thermoelectric response [.Delta]S is sensitive to the logarithmic energy derivative of the additional bundle resistivity ([.rho]a) which is identified with the adsorbed molecules. The response is therefore specific to the details of the interaction of the adsorbed molecule with the nanotube wall; even gases such as He, N2 and H2 can be easily detected. Plots of [Δ]S vs. [ρ]a are sensitive to whether oxidation or reduction of the tube wall is taking place, and to whether the gas molecule is physisorbed or chemisorbed. The utility of the sensor stems from the amphoteric nature of the SWNT, the quasi-one-dimensional character of the charge conduction and the high specific surface area of SWNTs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 633: Symposium A – Nanotubes and Related Materials , 2000 , A14.20
Copyright
Copyright © Materials Research Society 2001

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