Development of ceramic electrochemical sensor based on Bi2Ru2O7+x − RuO2 sub-micron oxide sensing electrode for water quality monitoring |
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Authors: | Serge Zhuiykov |
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Affiliation: | Commonwealth Scientific Industrial Research Organisation (CSIRO), Materials Science and Engineering Division, 37 Graham Road, Highett, VIC 3190, Australia |
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Abstract: | Sub-micron Bi2Ru2O7+x + RuO2 oxide sensing electrodes (SE) for water quality sensors were prepared on platinised ceramic substrate of the sensor. Their morphology was analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray analysis (EDX). Sensing properties of the Bi2Ru2O7+x + RuO2-SE were investigated for potentiometric detection of pH and dissolved oxygen (DO) in water in the temperature range of 4–30 °C. Sensor was capable to measure DO from 0.5 to 8.0 ppm and pH from 2.0 to 13.0, respectively. The obtained results show acceptable linearity of the measuring characteristics. Long-term stability trial for Bi2Ru2O7+x + RuO2-SE revealed that bio-fouling can be one of the main destructive factors affecting the performance of the sensors in the long run. The screen-printing technology used in the multi-sensory implementation provides fundamental properties of miniaturization, reasonable accuracy and low cost. |
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Keywords: | Solid-state sensors Water quality monitoring Oxide sensing electrode RuO2 |
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