Abstract
We report here that an impedancemetric sensor based on yttria-stabilized zirconia (YSZ) can detect propene (C 3H 6) sensitively and selectively under wet condition, if the sensing-electrode (SE) material and the operating condition are selected properly. Among the various single-oxide SEs examined, ZnO was found to give rather high sensitivity to C 3H 6 as well as negligible sensitivity to CH 4 at 600 °C in the presence of 1 vol.% H 2O. In addition, when 1.5 wt.% Pt was loaded on ZnO-SE and the SE was polarized at +50 mV versus Pt counter-electrode (CE), the present sensor was found to detect C 3H 6 rather sensitively with little interference of other gases, such as CO, NO, NO 2, H 2, CH 4, CO 2, H 2O and O 2, at 600 °C.
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