Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Characteristics and Preparation of Gas Sensor Using ZnO Nanorods Grown by Hydrothermal Process

수열합성법으로 성장된 ZnO 나노로드 가스 센서의 제작 및 특성 연구

  • Jong, Jong-Hun (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan) ;
  • Yu, Il (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan)
  • 정종훈 (동의대학교 물리학과, 부산 IT융합부품연구소) ;
  • 유일 (동의대학교 물리학과, 부산 IT융합부품연구소)
  • Received : 2011.02.09
  • Accepted : 2011.03.26
  • Published : 2011.04.27
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Abstract

ZnO nanorods for gas sensors were prepared by a hydrothermal method. The ZnO gas sensors were fabricated on alumina substrates by a screen printing method. The gas-sensing properties of the ZnO nanorods were investigated for $CH_4$ gas. The effects of growth time on the structural and morphological properties of the ZnO nanorods were investigated by X-ray diffraction and scanning electron microscope. The XRD patterns of the nanocrystallized ZnO nanorods showed a wurtzite structure with the (002) predominant orientation. The diameter and length of the ZnO nanorods increased in proportion to the growth time. The sensitivity of the ZnO sensors to 5 ppm $CH_4$ gas was investigated for various growth times. The ZnO sensors exhibited good sensitivity and rapid response-recovery characteristics to $CH_4$ gas, and both traits were dependent on the growth time. The highest sensitivity of the ZnO sensors to $CH_4$ gas was observed with the growth time of 7 h. The response and recovery times were 13 s and 6 s, respectively.

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References

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