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Electrochemical interdigitated conductimetric ph sensor based on RuO2 thick film sensitive layer

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

Authors

Katarina Cvejin

Jan Kulawik

Krzysztof Zaraska

Dorota Szwagierczak



Abstract

Metal oxide based electrochemical pH sensors are an alternative to the glass pH sensor, exhibiting many potential advantages in industrial and laboratory applications. In particular, thick film based pH sensors are promising devices for a next generation of wireless sensors for online monitoring of water pollution. So far, there have been many solid state materials used for pH sensor fabrication, among which RuO 2 based sensitive material stands out due to its excellent sensitivity and high accuracy. In potentiometric measurements, the RuO 2 based pH sensor exhibited excellent sensing performance with sensitivity close to the theoretical Nernstian value. In this work, an interdigitated conductimetric pH sensor based on RuO 2 sensitive layer was fabricated by screen printing technology on an alumina substrate. The RuO 2 sensitive layer was deposited on the top of the interdigitated Ag electrode. The impedance spectroscopic studies carried out in the frequency range of 10 mHz - 2 MHz revealed a decrease in the sensor resistance when it was exposed to the test solutions with increasing pH value. The relative change in conductance was found to be almost linear function of pH in the range of 3-11 at 1 kHz. The conductimetric pH sensors can be used for fabrication of low cost miniaturized sensors based on monitoring of the variation of electrical parameters as a function of pH of test solutions.

Presentation Conference Type Conference Paper (Published)
Conference Name 2014 International Conference and Exposition on Electrical and Power Engineering (EPE)
Start Date Oct 16, 2014
End Date Oct 18, 2014
Online Publication Date Dec 4, 2014
Publication Date 2014-10
Deposit Date Jul 29, 2022
Publisher Institute of Electrical and Electronics Engineers
Book Title 2014 International Conference and Exposition on Electrical and Power Engineering (EPE)
DOI https://doi.org/10.1109/icepe.2014.6970020
Keywords RuO2 thick film, interdigitated electrode, conductimetric sensor, pH sensor
Public URL http://researchrepository.napier.ac.uk/Output/2893241