pH sensors based on iridium oxide

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Abstract
Results are presented on the pH-potential response of dc magnetron reactively sputtered iridium oxide films. The films exhibit a nearly Nernstian response to pH, no hysteresis effects, and minimal response to ionic interferences. Sensitivity to certain redox species is observed, however. In addition, methods are discussed for preparing model iridium oxide sensor surfaces for ultrahigh vacuum surface analytical studies. Stoichiometric IrO{sub 2}-like surfaces are shown to be relatively inert to gas phase water. However, hydroxylation of IrO{sub 2}-like surfaces can be induced by rf water plasma treatment. 17 refs., 5 figs.

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