Abstract
It has been found that the current through a Schottky barrier formed at the interface between palladium film and n-type titanium oxide (TiO 2) single crystal is sensitive to hydrogen or other reducing gases in the ambient. This effect is explained by taking account of the diminished barrier height at the Pd and TiO 2 interface caused by the action of gases, changing the work function of Pd metal. The change in the Pd work function estimated from the result is confirmed by the direct measurements of the metal surface potentials by use of a vibrating capacitor method. Similar electrical properties have been studied for junctions of TiO 2 with Pt, Au, Ni, Al, Cu, Mg and Zn, and of ZnO, CdS, GaP and Si w ith Pd.
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