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Highly Sensitive/Selective Miniature Potentiometric Carbon Monoxide Gas Sensors with Titania-Based Sensing Elements

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Miniature, potentiometric, solid-state CO sensors utilizing titania-based semiconducting oxide electrodes are studied at the operating temperature of the optimal response, i.e., 500°C. To improve the selectivity, sensitivity, and response time, yttria and palladium were mixed into the titania electrodes. Excellent sensing performance was obtained using an assembly of titania on one side and composite titania cermet synthesized by adding yttria and palladium on the other. The use of platinum contacts instead of gold current collectors afforded a substantial improvement in voltage response. The device detected an extended range of CO concentration (1–1000 ppm) with a high sensitivity to CO, while being capable of detecting even 1 ppm variations at low CO concentration ranges and retaining considerable selectivity to CO against CO2, NO, and O2 gases. Additionally, the response to CO is barely influenced by the coexisting interference gases (100 ppm NO, 16% CO2, 3% O2, 3% H2O).

Document Type: Research Article


Affiliations: 1: Department of Advanced Materials Engineering, Sejong University, Seoul 143-747, Korea 2: Department of Materials Science and Engineering, Chonnam National University, Gwangju 550-749, Korea 3: Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611

Publication date: April 1, 2010

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