Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Characteristics and Preparation of Gas Sensor Using Nano Indium Coated ZnO:In

나노 Indium을 부착한 ZnO:In 가스센서의 제작 및 특성

  • Jung, Jong-Hun (Department of Physics, Dong-Eui University and Convergence of IT Devices Institute Busan) ;
  • Yu, Yun-Sik (Radiological Science Department, 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) ;
  • 유윤식 (동의대학교 방사선학과) ;
  • 유일 (동의대학교 물리학과, 부산 IT융합부품연구소)
  • Received : 2011.07.04
  • Accepted : 2011.08.10
  • Published : 2011.09.27
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Abstract

Nano-indium-coated ZnO:In thick films were prepared by a hydrothermal method. ZnO:In gas sensors were fabricated by a screen printing method on alumina substrates. The gas sensing properties of the gas sensors were investigated for hydrocarbon gas. The effects of the indium concentration of the ZnO:In gas sensors on the structural and morphological properties were investigated by X-ray diffraction and scanning electron microscopy. XRD patterns revealed that the ZnO:In with wurtzite structure was grown with (1 0 0), (0 0 2), and (1 0 1) peaks. The quantity of In coating on the ZnO surface increased with increasing In concentration. The sensitivity of the ZnO:In sensors was measured for 5 ppm $CH_4$ gas and $CH_3CH_2CH_3$ gas at room temperature by comparing the resistance in air with that in target gases. The highest sensitivity to $CH_4$ gas and $CH_3CH_2CH_3$ gas of the ZnO:In sensors was observed at the In 6 wt%. The response and recovery times of the 6 wt% indiumcoated ZnO:In gas sensors were 19 s and 12 s, respectively.

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References

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