Title: A Flexible pH-Sensing Structure Using WO3/IrO2 Junction with Al2O3 Encapsulation Layer
Authors: Kuo, Li-Min
Chen, Kuan-Neng
Chuang, Yi-Lin
Chao, Shuchi
Department of Electrophysics
Department of Electronics Engineering and Institute of Electronics
Issue Date: 2013
Abstract: 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 (0.168 mu A/pH) between pH = 2 to 12. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.004303ssl] All rights reserved.
URI: http://hdl.handle.net/11536/21765
ISSN: 2162-8742
DOI: 10.1149/2.004303ssl
Volume: 2
Issue: 3
Begin Page: P28
End Page: P30
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