title: Elimination of flammable gas effects in cerium oxide semiconductor-type resistive oxygen sensors for monitoring low oxygen concentrations.
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.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan. itoh-toshio@aist.go.jp.
authors.forename: Toshio
authors.initials: T
authors.lastname: Itoh
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan. n-izu@aist.go.jp.
authors.forename: Noriya
authors.initials: N
authors.lastname: Izu
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan. t-akamatsu@aist.go.jp.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Akamatsu
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Shimo-Shidami, Moriyama-ku, Nagoya 463-8560, Japan. w.shin@aist.go.jp.
authors.forename: Woosuck
authors.initials: W
authors.lastname: Shin
authors.affiliation: Taiyo Nippon Sanso Corporation, 10 Okubo, Tsukuba, Ibaraki 300-2611, Japan. Yusuke.Miki@tn-sanso.co.jp.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Miki
authors.affiliation: Taiyo Nippon Sanso Corporation, 10 Okubo, Tsukuba, Ibaraki 300-2611, Japan. Yasuo.Hirose@tn-sanso.co.jp.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Hirose