| 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 |
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| ABSTRACT |
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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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