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Fabrication of H2 Gas Sensor Based on ZnO Nanarod Arrays by a Sonochemical Method

  • Lee, Mi-Sun (Department of Chemical Engineering, Kyungpook National University) ;
  • Oh, Eu-Gene (Department of Chemical Engineering, Kyungpook National University) ;
  • Jeong, Soo-Hwan (Department of Chemical Engineering, Kyungpook National University)
  • Received : 2011.04.12
  • Accepted : 2011.08.30
  • Published : 2011.10.20

Abstract

We report a simple method for fabricating ZnO gas sensors via a sonochemical route and their $H_2$ gas sensing properties. Vertically aligned ZnO nanorod arrays as a sensing material were synthesized on a Pt-electrode patterned alumina substrate under ambient conditions. The advantage of the proposed method is a high speed of processing. The gas sensor based on ZnO nanorod arrays with large specific surface area showed a high response to $H_2$ and a detection limit of 70 ppm at $250^{\circ}C$. Also, their response and recovery time were relatively short and a complete regeneration was observed. A mechanism for sensing $H_2$ gas on the surface of ZnO nanorods is proposed.

Keywords

References

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