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Sensors 2015, 15(4), 9427-9437; doi:10.3390/s150409427

Elimination of Flammable Gas Effects in Cerium Oxide Semiconductor-Type Resistive Oxygen Sensors for Monitoring Low Oxygen Concentrations

1
National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan
2
Taiyo Nippon Sanso Corporation, 10 Okubo, Tsukuba, Ibaraki 300-2611, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 17 March 2015 / Revised: 17 April 2015 / Accepted: 20 April 2015 / Published: 21 April 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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Abstract

We have investigated the catalytic layer in zirconium-doped cerium oxide, Ce0.9Zr0.1O2 (CeZr10) resistive oxygen sensors for reducing the effects of flammable gases, namely hydrogen and carbon monoxide. When the concentration of flammable gases is comparable to that of oxygen, the resistance of CeZr10 is affected by the presence of these gases. We have developed layered thick films, which consist of an oxygen sensor layer (CeZr10), an insulation layer (Al2O3), and a catalytic layer consisting of CeZr10 with 3 wt% added platinum, which was prepared via the screen printing method. The Pt-CeZr10 catalytic layer was found to prevent the detrimental effects of the flammable gases on the resistance of the sensor layer. This effect is due to the catalytic layer promoting the oxidation of hydrogen and carbon monoxide through the consumption of ambient O2 and/or the lattice oxygen atoms of the Pt-CeZr10 catalytic layer. View Full-Text
Keywords: resistive oxygen sensor; cerium oxide; zirconium-doped cerium oxide; layered thick film; catalytic layer; platinum resistive oxygen sensor; cerium oxide; zirconium-doped cerium oxide; layered thick film; catalytic layer; platinum
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Itoh, T.; Izu, N.; Akamatsu, T.; Shin, W.; Miki, Y.; Hirose, Y. Elimination of Flammable Gas Effects in Cerium Oxide Semiconductor-Type Resistive Oxygen Sensors for Monitoring Low Oxygen Concentrations. Sensors 2015, 15, 9427-9437.

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