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http://dx.doi.org/10.4191/KCERS.2010.47.1.092

A Scientific Approach for Improving Sensitivity and Selectivity of Miniature, Solid-state, Potentiometric Carbon Monoxide Gas Sensors by Differential Electrode Equilibria Mechanism  

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)
Publication Information
Journal of the Korean Ceramic Society / v.47, no.1, 2010 , pp. 92-96 More about this Journal
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
Gas sensor; Carbon monoxide; Titania; $La_2CuO_4$;
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