Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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NO2 gas mixed-potential sensor based on positive temperature coefficient ceramics self-operated thermostatic controller
Zilong LIANNa ZHANGXiaohong ZHENGCheng ZHANG
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2020 Volume 128 Issue 3 Pages 124-129

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Abstract

For a proper operation, conventional gas sensors based on solid electrolytes usually require complex heating elements and temperature control systems to ensure the transfer of ions inside a solid electrolyte substrate. In this study, a positive temperature coefficient (PTC) ceramic was used for the first time as a heating source to successfully compose a self-thermostatic potential NO2 gas sensor. Powered by a 12-V multi-batteries, the PTC ceramic can be quickly heated to and stabilised at 250°C to provide the necessary working temperature to the sensor. It was proved that this self-thermostatic sensor displays a high NO2 sensitivity (84.60 mV/decade) toward 5–150 ppm NO2 at different ambient temperatures. Meanwhile, it exhibits a high NO2 selectivity, along with excellent repeatability and stability. This simple and effective method is a solution to the significant obstruction of traditional gas sensors with burdensome heating structures, allowing a broad application to various types of on-site gas detection.

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© 2020 The Ceramic Society of Japan
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