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Sensors 2017, 17(1), 97; doi:10.3390/s17010097

Mixed-Potential Gas Sensors Using an Electrolyte Consisting of Zinc Phosphate Glass and Benzimidazole

National Institute of Advanced Industrial Science and Technology (AIST), Inorganic Functional Materials Research Institute, 2266-98, Anagahora, Shimo-Shidami, Moriyama-ku, Nagoya-shi 463-8560, Japan
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Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 16 November 2016 / Revised: 29 December 2016 / Accepted: 3 January 2017 / Published: 5 January 2017
(This article belongs to the Special Issue Gas Sensors for Health Care and Medical Applications)
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Abstract

Mixed-potential gas sensors with a proton conductor consisting of zinc metaphosphate glass and benzimidazole were fabricated for the detection of hydrogen produced by intestinal bacteria in dry and humid air. The gas sensor consisting of an alumina substrate with platinum and gold electrodes showed good response to different hydrogen concentrations from 250 parts per million (ppm) to 25,000 ppm in dry and humid air at 100–130 °C. The sensor response varied linearly with the hydrogen and carbon monoxide concentrations due to mass transport limitations. The sensor responses to hydrogen gas (e.g., −0.613 mV to 1000 ppm H2) was higher than those to carbon monoxide gas (e.g., −0.128 mV to 1000 ppm CO) at 120 °C under atmosphere with the same level of humidity as expired air. View Full-Text
Keywords: gas sensor; mixed-potential; zinc phosphate glass; hydrogen gas sensor; mixed-potential; zinc phosphate glass; hydrogen
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Akamatsu, T.; Itoh, T.; Shin, W. Mixed-Potential Gas Sensors Using an Electrolyte Consisting of Zinc Phosphate Glass and Benzimidazole. Sensors 2017, 17, 97.

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