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Principles and mechanisms of gas sensing by GaN nanowires functionalized with gold nanoparticles

J. Appl. Phys. 99, 104302 (2006); doi:10.1063/1.2195420

Published 23 May 2006

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Vladimir Dobrokhotov and D. N. McIlroy
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903

M. Grant Norton
School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920

A. Abuzir, W. J. Yeh, Ian Stevenson, R. Pouy, J. Bochenek, M. Cartwright, Lidong Wang, J. Dawson, Miles Beaux, and Chris Berven
Department of Physics, University of Idaho, Moscow, Idaho 83844-0903
Electrical properties of a chemical sensor constructed from mats of GaN nanowires decorated with gold nanoparticles as a function of exposure to Ar, N2, and methane are presented. The Au nanoparticle decorated nanowires exhibited chemically selective electrical responses. The sensor exhibits a nominal response to Ar and slightly greater response for N2. Upon exposure to methane the conductivity is suppressed by 50% relative to vacuum. The effect is fully reversible and is independent of exposure history. We offer a model by which the change in the current is caused by a change in the depletion depth of the nanowires, the change in the depletion depth being due to an adsorbate induced change in the potential on the gold nanoparticles on the surface of the nanowires. ©2006 American Institute of Physics
History: Received 10 January 2006; accepted 14 February 2006; published 23 May 2006
Permalink: http://link.aip.org/link/?JAPIAU/99/104302/1
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KEYWORDS and PACS

Keywords
PACS
  • 07.07.Df
    Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
  • 82.80.-d
    Chemical analysis and related physical methods of analysis
  • 73.63.Bd
    Nanocrystalline materials (electronic transport)
  • YEAR: 2006

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PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
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