Electrochemical impedance spectroscopic analysis of RuO2 based thick film pH sensors

Manjakkal, L. , Djurdjic, E., Cvejin, K., Kulawik, J., Zaraska, K. and Szwagierczak, D. (2015) Electrochemical impedance spectroscopic analysis of RuO2 based thick film pH sensors. Electrochimica Acta, 168, pp. 246-255. (doi:10.1016/j.electacta.2015.04.048)

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Abstract

The conductimetric interdigitated thick film pH sensors based on RuO2 were fabricated and their electrochemical reactions with solutions of different pH values were studied by electrochemical impedance spectroscopy (EIS) technique. The microstructural properties and composition of the sensitive films were examined by scanning electron microscopy, X-ray energy dispersive spectroscopy and Raman spectroscopy. The EIS analysis of the sensor was carried out in the frequency range 10 mHz–2 MHz for pH values of test solutions 2–12. The electrical parameters of the sensor were found to vary with changing pH. The conductance and capacitance of the film were distinctly dependent on pH in the low frequency range. The Nyquist and Bode plots derived from the impedance data for the metal oxide thick film pH sensor provided information about the underlying electrochemical reactions.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Manjakkal, Dr Libu
Authors: Manjakkal, L., Djurdjic, E., Cvejin, K., Kulawik, J., Zaraska, K., and Szwagierczak, D.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Electrochimica Acta
Publisher:Elsevier
ISSN:0013-4686
ISSN (Online):1873-3859|
Published Online:09 April 2015

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