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Microstructural, Impedance Spectroscopic and Potentiometric Analysis of Ta₂O₅ Electrochemical Thick Film pH Sensors

Manjakkal, Libu; Cvejin, Katarina; Bajac, Branimir; Kulawik, Jan; Zaraska, Krzysztof; Szwagierczak, Dorota


Katarina Cvejin

Branimir Bajac

Jan Kulawik

Krzysztof Zaraska

Dorota Szwagierczak


Two types of pH sensors based on Ta2O5 thick films, interdigitated conductimetric and potentiometric ones, were screen printed on an alumina substrate. Their properties were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, electrochemical impedance spectroscopy and potentiometry. The impedance spectroscopic studies of the fabricated thick film sensors were carried out in the frequency range of 10 Hz–2 MHz in test solutions of pH 3–12. The conductance, capacitance and impedance of the fabricated conductimetric Ta2O5 sensor were found to be distinctly pH-dependent at low frequencies. For potentiometric sensors, a sub-Nernstian behavior was obtained.

Journal Article Type Article
Acceptance Date Dec 19, 2014
Online Publication Date Feb 6, 2015
Publication Date 2015-03
Deposit Date Jul 20, 2022
Journal Electroanalysis
Print ISSN 1040-0397
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 27
Issue 3
Pages 770-781
Keywords Electrochemistry; Analytical Chemistry
Public URL