Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Enhanced Gas Sensing Properties of Pt-Loaded TeO2 Nanorods

  • Jin, Chang-Hyun (Department of Materials science and Engineering, Inha University) ;
  • Park, Sung-Hoon (Department of Materials science and Engineering, Inha University) ;
  • Kim, Hyun-Su (Department of Materials science and Engineering, Inha University) ;
  • Lee, Chong-Mu (Department of Materials science and Engineering, Inha University)
  • Received : 2011.12.21
  • Accepted : 2012.02.28
  • Published : 2012.06.20
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Abstract

The $NO_2$ gas sensing properties of multiple-networked, Pt-loaded $TeO_2$ nanorod sensors were examined. Scanning electron microscopy revealed nanowires with diameters of 50-100 nm and lengths of a few micrometers. Transmission electron microscopy and X-ray diffraction showed that the nanrods were tetragonal-structured, single crystal $TeO_2$. The Pt-loaded $TeO_2$ nanorod sensors exhibited sensitivities of 11.00, 10.26, 11.23 and 11.97% at $NO_2$ concentrations of 10, 50, 100 and 200 ppm, respectively, at $300^{\circ}C$. These sensitivities were more than 10 times higher than those of bare-$TeO_2$ nanorod sensors. The response times of the sensors were 310, 260, 270 and 230 sec at $NO_2$ concentrations of 10, 50, 100 and 200 ppm, respectively. The recovery times of the Pt-loaded $TeO_2$ nanorods were 390, 330, 335, and 330 sec at $NO_2$ concentrations of 10, 50, 100 and 200 ppm, respectively. The origin of the enhanced sensing properties of the $TeO_2$ nanorods by Pt loading is discussed.

Keywords

References

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