A flexible pH-sensing structure using WO3/IrO2 junction with Al2O3 encapsulation layer

Li Min Kuo, Kuan-Neng Chen, Yi Lin Chuang, Shuchi Chao

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A diode-like current-voltage characteristic in response to hydrogen-ions based on a WO3/IrO2 diode coated with a membrane-like Al2O3 is reported.Microsensors fabricated with the oxides (IrO2 and WO3) will suffer from interference errors in pH-measurements due to their strong responses to environmental redox species. With ionic-conductive and insulation properties, the membrane can mediate the transport of released protons and block the electrons from redox species in solutions. Invoking proton-electron double injection, H+ and e - produce redox reactions, which control the conductivity and preserve the continuity of currents across the interface with a good sensitivity (0.168μA/pH) between pH = 2 to 12.

Original languageEnglish
JournalECS Solid State Letters
Issue number3
StatePublished - 29 Jul 2013

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