Thick Film Metal Metal Oxide Based pH Sensors for Water Pollution Monitoring

Manjakkal, L. (2015) Thick Film Metal Metal Oxide Based pH Sensors for Water Pollution Monitoring. In: Senseiver 2015 International Conference, Novi Sad, Serbia, 7-10 Oct 2015, pp. 66-71.

Abstract

This work was aimed at investigation of new thick film metal oxide sensitive electrodes for the next generation of low cost wireless pH sensors. Potentiometric and conductimetric pH sensors based on RuO2, Ta2O5, SnO2, TiO2, RuO2-Ta2O5, RuO2-SnO2, RuO2-TiO2 and RuO2-Ta2O5-glass were fabricated by thick film technology. For potentiometric sensors, a reference Ag/AgCl/KCl electrode was developed and deposited on an alumina substrate by screen printing method. A low cost miniaturized potentiometric pH sensor was developed using LTCC (low temperature cofired ceramic) technology and a wireless system for online solution monitoring operating with the fabricated sensor was successfully tested. The crystal structure, phase and elemental composition and microstructure of the films were investigated by X-ray diffractometry, Raman spectroscopy, optical and scanning electron microscopy and energy dispersive spectroscopy. The sensing mechanism was analyzed by using X-ray photoelectron spectroscopy (XPS), potentiometric method and electrochemical impedance spectroscopy (EIS).

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Manjakkal, Dr Libu
• Authors: Manjakkal, L.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering