Analytical Sciences

Toluene-sensing Properties of Mixed-potential Type Yttria-stabilized Zirconia-based Gas Sensors Attached with Thin CeO₂-added Au Electrodes

Nobumitsu OIDE, Taro UEDA, Kai KAMADA, Takeo HYODO, and Yasuhiro SHIMIZU

Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan

Toluene-sensing properties of mixed-potential type yttria-stabilized zirconia (YSZ)-based sensors attached with a thin CeO₂-added Au sensing electrode (SE, CeO₂ content: 4 – 16 mass%, thickness: 30 – 100 nm), which was fabricated by using a spin-coating method, were examined and the effects of their SE thickness and the additive amount of CeO₂ on their toluene response were discussed in this study. The toluene response of the sensors attached with a 16 mass% CeO₂-added Au SE increased with an increase in the SE thickness, and the sensor attached with the thickest 16 mass% CeO₂-added Au SE showed the largest response, among all the sensors tested. This behavior probably arises from the increase in the number of active sites for electrochemical toluene oxidation in the CeO₂-added Au SE.

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