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Potentiometric and conductimetric pH sensors based on RuO2-TiO2 thick films
Keywords: Thick film, RuO2-TiO2, pH sensors
Ion sensitive metal oxides are attractive materials for designing and implementing of highly sensitive low cost wireless pH sensors. In this work, RuO2-TiO2 based pH sensors were prepared by thick film technology on an alumina substrate and characterized by potentiometric and conductimetric methods. For potentiometric measurements, a thick film RuO2-TiO2 pH sensitive electrode and an Ag/AgCl reference electrode were fabricated on the same substrate. The potential difference between the reference and sensitive electrodes in various test solutions was found to be proportional to the pH of a solution according to the Nernst relationship. The fabricated sensor exhibits a sensitivity of 57±1 mV/pH with a very fast response time less than 30 s in a pH range of 2-12. Good sensing performance indicates that the thick film potentiometric pH sensor can be an alternative to the traditional glass pH sensor. For conductimetric pH measurements, the sensitive material was screen printed on the surface of an interdigitated electrode. The impedance spectroscopy method was used for characterization of the properties of the sensitive film in a frequency range of 1 Hz to 2 MHz and the response as a function of the pH of a solution was investigated. The sensor conductance was found to show a linear dependence on the pH value in the range of 4-11. The obtained results confirm usefulness of both types of thick film metal oxide based pH sensors due to their advantageous features such as low cost, miniaturized size, accuracy and reliability. The fabricated sensors are intended to be used for monitoring of water pollution.
Libu Manjakkal, Researcher
Institute of Electron Technology, Krakow Division
Krakow, Malopolskie

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