Magnetite Coated Iron Wire and Molybdenum Oxide-Coated Molybdenum Wire as pH Sensor

Abstract

The magnetite-coated iron wire and molybdenum oxide-coated molybdenum wire electrodes, prepared by treating iron and molybdenum wires in an alkaline solution at the boiling temperature and connecting to the gate of the field effect transistor, showed a near-Nernstian behavior in the pH range between 4 to 11 and between 2 to 12, respectively. Whereas the pH response of the magnetite-coated iron wire electrode was affected by halide ions seriously, the molybdenum oxide-coated molybdenum electrode was found to retard the interference of halide ions effectively.