Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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A Scientific Approach for Improving Sensitivity and Selectivity of Miniature, Solid-state, Potentiometric Carbon Monoxide Gas Sensors by Differential Electrode Equilibria Mechanism

전극평형전위차 가스 센싱 메커니즘을 적용한 일산화탄소 소형 전위차센서의 특성 향상에 관한 연구

  • Park, Jun-Young (Department of Advanced Materials Engineering, Sejong University) ;
  • Kim, Ji-Hyun (Department of Advanced Materials Engineering, Sejong University) ;
  • Park, Ka-Young (Department of Advanced Materials Engineering, Sejong University) ;
  • Wachsman, Eric D. (Department of Materials Science and Engineering, University of Florida)
  • 박준영 (세종대학교 신소재공학과) ;
  • 김지현 (세종대학교 신소재공학과) ;
  • 박가영 (세종대학교 신소재공학과) ;
  • Published : 2010.01.31
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Abstract

Based on the differential electrode equilibria approach, potentiometric YSZ sensors with semiconducting oxide electrodes for CO detection are developed. To improve the selectivity, sensitivity and response-time of the sensor, our strategy includes (a) selection of an oxide with a semiconducting response to CO, (b) addition of other semiconducting materials, (c) addition of a catalyst (Pd), (d) utilization of combined p- and n-type electrodes in one sensor configuration, and (e) optimization of operating temperatures. Excellent sensing performance is obtained by a novel device structure incorporating $La_2CuO_4$ electrodes on one side and $TiO_2$-based electrodes on opposite substrate faces with Pt contacts. The resulting response produces additive effects for the individual $La_2CuO_4$ and $TiO_2$-based electrodes voltages, thereby realizing an even higher CO sensitivity. The device also is highly selective to CO versus NO with minor sensitivity for NO concentration, compared to a notably large CO sensitivity.

Keywords

References

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