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九大院総理工a、九大産学連携センターb SENSING PERFORMANCES OF IMPEDANCEMETRIC ZIRCONIA-BASED SENSOR Hanako KASUGAa and Taro KYUSHU b We have recently proposed and examined new-type impedancemetric sensors using yttria-stabilized zirconia (YSZ) and oxide sensing-electrode (SE) for detection of total NOx, H2O and hydrogen-containing gases at high temperatures. Here, we report that this type impedancemetric sensor based on YSZ can detect some hydrocarbons (HCs) sensitively and selectively under wet condition, if the selection of SE material and operating condition could be made properly. Among the various single-oxide SEs examined, SnO2 gave the highest sensitivity to C3H6 at 600℃. However, this oxide has also given relatively high sensitivity to CH4 which is not regulated as an air pollutant. Thus, we have chosen ZnO as an SE material which gives rather high sensitivity to C3H6 as well as negligible sensitivity to CH4. In addition, when 1.5 wt.% Pt was added to ZnO-SE and +50 mV vs. Pt counter electrode (CE) / reference electrode (RE) was applied to this SE, the present sensor was found to detect C3H6 rather sensitively having little interference with other gases, such as CO, NO, NO2, H2 and CH4, at 600℃ even in the presence of 1 vol.% H2O.
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