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J. Korean Ceram. Soc. > Volume 47(1); 2010 > Article
Journal of the Korean Ceramic Society 2010;47(1): 92.
doi: https://doi.org/10.4191/kcers.2010.47.1.092
전극평형전위차 가스 센싱 메커니즘을 적용한 일산화탄소 소형 전위차센서의 특성 향상에 관한 연구
박준영, 김지현, 박가영, 박가영1
세종대학교 신소재공학과
1플로리다 대학교 재료공학과
A Scientific Approach for Improving Sensitivity and Selectivity of Miniature, Solid-state, Potentiometric Carbon Monoxide Gas Sensors by Differential Electrode Equilibria Mechanism
Jun-Young Park, Ji-Hyun Kim, Ka-Young Park, Eric D. Wachsman1
Department of Advanced Materials Engineering, Sejong University
1Department of Materials Science and Engineering, University of Florida
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.
Key words: Gas sensor, Carbon monoxide, Titania, $La_2CuO_4$
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