The nature of the photolysis of silver at an oxide semiconductor surface

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Abstract
The photolytic reduction of silver ions adsorbed from solution on solid oxide surfaces is described. Studies of silver on titanium dioxide exposed to ultraviolet-light irradiation show a photochemical change that is very dependent on the state of hydration of the surface. The diffuse reflectance of the material in the form of compacted powders decreases with exposure. For dry samples it can be shown that the kinetics of the process follows an exponential rate law. The visible and infrared spectral characteristics are investigated and interpreted in terms of a model postulating electronic trapping centers localized at the surface of the oxide. Evidence is presented showing that groups of silver atoms are able to dissociate and rearrange on the solid surface. The nature and mechanism of the interaction with the semiconductor oxide surface is discussed.

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