Abstract
Although is known as a CO-selective gas sensor that responds to CO gas more sensitively than to gas, non-ohmic curves and thus voltage-dependent sensitivity were observed when used with Pt electrodes. In order to study the observed voltage-dependent resistance, one side of was contacted with ZnO (or In this configuration, the asymmetric curve was shown due to the ohmic interface between ZnO (or and and the non-ohmic interface between Pt and The impedance spectra of the layered sample also indicated that the interfacial resistance of increased with applied bias. The time-dependent current and potential measurements showed the slowly increasing resistance when was positively biased, This observation was explained by the field-induced adsorption of oxygen gas (or the electroadsorptive effect). © 2001 The Electrochemical Society. All rights reserved.
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