Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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Substantial Enhancement of the Response and Sensing Speed of WO3 Nanotubes Toward NO2 Gas by Au-functionalization

  • Ko, Hyunsung (Department of Materials Science and Engineering, Inha University) ;
  • Park, Sangbo (Department of Materials Science and Engineering, Inha University) ;
  • Hong, Taeseop (Department of Materials Science and Engineering, Inha University) ;
  • Park, Sunghoon (Department of Materials Science and Engineering, Inha University) ;
  • Lee, Chongmu (Department of Materials Science and Engineering, Inha University)
  • Published : 2014.02.10
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Abstract

Au-functionalized $WO_3$ nanotubes were synthesized using ZnO nanowire templates. Transmission electron microscopy revealed the Au nanoparticles on the outer surface of a typical $WO_3$ nanotube ranged from 5 to 25 nm. The multiple networked Au-functionalized $WO_3$ nanotube sensors showed responses of 820-3, 924% in the $NO_2$ concentration range of 1-5 ppm at $300^{\circ}C$. These responses were approximately 5-12 fold higher than those observed for pristine $WO_3$ nanotube sensors over the same $NO_2$ concentration range. A model describing the gas sensing mechanism of Au-functionalized $WO_3$ nanotubes is discussed.

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