Abstract
The work was aimed at investigation of metal oxide thick film sensitive electrodes being attractive materials for the next generation of low cost wireless pH sensors. In this study, thick film potentiometric and conductimetric RuO2 based pH sensors were fabricated by screen printing method. This method allows preparation of cheap, miniaturized and accurate pH sensors without deterioration of sensing performance. The microstructural studies of the fabricated sensors, and the results of potentiometric and AC conductance measurements carried out as a function of pH value of test solutions were discussed. The sensor fabricated by using 1 kΩ/sq. resistive thick film paste exhibited sensitivity about 60 mV/pH in a wide pH range of 2–11. The potentiometric studies revealed that the sensor response was in a very good agreement with the theoretical Nernstian behavior. The conductimetric pH sensor at 1 kHz frequency showed a linear dependence of electromotive force on pH value in the range of 3–11. The applicability of the sensors in measurement of pH of water was confirmed.
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