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TiO2-Based Thick Film pH Sensor

Simic, Mitar; Manjakkal, Libu; Zaraska, Krzysztof; Stojanovic, Goran M.; Dahiya, Ravinder


Mitar Simic

Krzysztof Zaraska

Goran M. Stojanovic

Ravinder Dahiya


Miniaturized electrochemical pH sensors are increasingly in demand for applications such as online monitoring of water quality and health monitoring. The metal oxides are the best candidates for sensing electrodes of such sensors as they offer high chemical stability. In this paper, we present a novel approach to obtain interdigitated conductimetric pH sensor using screen printing of TiO 2 thick film on an alumina substrate. The microstructural and crystalline properties of the TiO 2 sensitive film were examined with scanning electron microscopy and Raman spectroscopy. The impedance spectroscopic studies of the fabricated thick film sensor were carried out in the frequency range of 5-20 kHz for the test solutions in the pH range of 4-10 and it was observed that the impedance of the film is distinctly dependent on pH. Using the measured impedance data, we have also proposed an equivalent RC network model for the fabricated pH sensor. The physical meaning of the model parameters was determined by electrochemical impedance spectroscopic analysis, and through statistical analysis it was found that all parameters are distinctly pH-dependent.

Journal Article Type Article
Acceptance Date Nov 16, 2016
Online Publication Date Nov 15, 2016
Publication Date Jan 15, 2017
Deposit Date Jul 20, 2022
Journal IEEE Sensors Journal
Print ISSN 1530-437X
Electronic ISSN 1558-1748
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 17
Issue 2
Pages 248-255
Keywords Electrical and Electronic Engineering; Instrumentation
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