Electronic semiconducting oxides as pH sensors

Agner Fog, Richard P. Buck

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Abstract

Limitations on the response of electronically-conducting oxides as pH sensors are demonstrated PtO2, IrO2, RuO2, OsO2, Ta2O5 and TiO2 showed near-Nernstian behavior in the pH range 2 - 12 in air-saturated solutions. Interferences from selected reducing and oxidizing agents and from some complexing anions were measured and catalogued. No interference from monovalent cations (Group IA) was observed. Several reaction mechanisms are proposed and discussed.
Original languageEnglish
JournalSensors and Actuators
Volume5
Pages (from-to)137-146
ISSN1054-6693
Publication statusPublished - 1984
Externally publishedYes

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