TiO2 based thick film pH sensor

Simic, M., Manjakkal, L. , Zaraska, K., Stojanovic, G. and Dahiya, R. (2016) TiO2 based thick film pH sensor. IEEE Sensors Journal, 17(2), pp. 248-255. (doi:10.1109/JSEN.2016.2628765)

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Abstract

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 work, we present a novel approach to obtain interdigitated conductimetric pH sensor using screen printing of TiO2 thick film on an alumina substrate. The microstructural and crystalline properties of the TiO2 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 (EIS) analysis, and through statistical analysis it was found that all parameters are distinctly pH-dependent.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Manjakkal, Dr Libu and Dahiya, Professor Ravinder
Authors: Simic, M., Manjakkal, L., Zaraska, K., Stojanovic, G., and Dahiya, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Sensors Journal
Publisher:IEEE
ISSN:1530-437X
ISSN (Online):1558-174
Published Online:15 November 2016
Copyright Holders:Copyright © 2016 Institute of Electrical and Electronics Engineers
First Published:First published in IEEE Sensors Journal 17(2):248-255
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
682141CONTESTRavinder DahiyaEuropean Commission (EC)317488ENG - ENGINEERING ELECTRONICS & NANO ENG
663861Engineering Fellowships for Growth: Printed Tactile SKINRavinder DahiyaEngineering & Physical Sciences Research Council (EPSRC)EP/M002527/1ENG - ENGINEERING ELECTRONICS & NANO ENG