Gas-sensitive Ag ion conduction in semiconducting ZnO thin films
Abstract A new type of reducing gas sensing system has been developed based on changes in ionic conductivity. Though it is well known that the resistivity of n-type semiconductors such as ZnO decreases on the introduction of reducing gases, that of thin films sputtered on silica glasses in the present study (which had Ag electrodes) increased with the introduction of reducing gases. This abnormal property is due to the change in the ionic resistance of Ag+ incorporated from the electrode.