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Electron transport of nanotube-based gas sensors: An ab initio study

Appl. Phys. Lett. 92, 022103 (2008); doi:10.1063/1.2829609

Published 14 January 2008

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Arta Sadrzadeh, Amir A. Farajian, and Boris I. Yakobson
Department of Mechanical Engineering and Materials Science and Department of Chemistry, Rice University, Houston, Texas 77251, USA
The effect of physisorption of NO2 gas molecules on quantum transport properties of semiconducting carbon nanotubes is studied using ab initio calculations and Green function formalism. The results show that the conductance change is mainly due to the electric dipole moment of NO2. It is also shown that upon exposure of nanotube to different concentrations of gas, the common feature is the shift in conductance toward lower energies. This suggests that physisorption of NO2 will result in a decrease (increase) in conductance of p-type (n-type) nanotubes with Fermi energies close to the edge of valence and conduction band. ©2008 American Institute of Physics
History: Received 23 September 2007; accepted 7 December 2007; published 14 January 2008
Permalink: http://link.aip.org/link/?APPLAB/92/022103/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.07.Df
    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • 82.80.Fk
    Electrochemical analytical methods
  • YEAR: 2008

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ISSN:
0003-6951 (print)   1077-3118 (online)
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