한국재료학회지 (Korean Journal of Materials Research)

  • 제28권1호
  • /
  • Pages.12-17
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  • 2018
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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폴리머 용액법에 의한 In2O3 첨가 나노 WO3 분말 합성 및 NO2 가스 센서 특성

NO2 Gas Sensing Properties of Nano-Sized In2O3 Doped WO3 Powders Prepared from Polymer Solution Route

  • 김동민 (국립목포대학교 신소재공학과) ;
  • 이상진 (국립목포대학교 신소재공학과)
  • Kim, Dong Min (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Lee, Sang-Jin (Department of Advanced Materials Science and Engineering, Mokpo National University)
  • 투고 : 2017.10.22
  • 심사 : 2017.11.13
  • 발행 : 2018.01.27
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초록

$In_2O_3$ doped $WO_3$ powders were prepared by a polymer solution route and their $NO_2$ gas sensing properties were analyzed. The synthesized powders showed nano-sized particles with specific surface areas of $6.01{\sim}21.5m^2/g$ and the particle size and shape changed according to the content of $In_2O_3$. The gas sensors fabricated with the synthesized powders were tested at operating temperatures of $400{\sim}500^{\circ}C$ and 100~500 ppm concentrations of $NO_2$ atmosphere. The particle size and $In_2O_3$ content affected on the initial sensor resistance in an air atmosphere. The highest sensitivity (8.57 at $500^{\circ}C$), which was 1.77 higher than the sensor consisting of the pure $WO_3$ sample, was measured in the 0.5 mol% $In_2O_3$ doping sample. In addition, the response time and recovery time were improved by the addition of $In_2O_3$.

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