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Proceedings Paper

Multi-layered water quality sensor based on RuO2 nanostructures
Author(s): Serge Zhuiykov
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Paper Abstract

Multi-layered sensor based on nanostructured ruthenium oxide (RuO2) sensing electrode (RuO2-SE) deposited on platinized alumina substrate and capable of being coupled with a simple turbidity sensor has been evaluated for long-term pH stability during an 18-month continuous trial. The sensor is designed to detect the main parameters of water quality: pH and dissolved oxygen (DO) over a temperature range of 9-30°C. The chemical composition and morphology of the RuO2-SE was investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). It was found that both the morphology and surface compositions of nanostructured RuO2-SEs did not change significantly after 18-months trial. They maintain their high sensitivity to adsorption of superoxide ions (O2-) despite heavy bio-fouling. Sensors with RuO2-SE have demonstrated a stable Nernstian response to pH from 2.0 to 13.0 and were also capable of measuring DO in the range of 0.5 - 8.0 ppm. The measurement results show very good linearity, and excellent reproducibility was obtained during a trial. The Nernstian slope was approximately 58mV/pH at a temperature of 23°C. Although RuO2-SEs have been shown to exhibit very good response time to pH changes, within few seconds at a temperature of 23°C, as the water temperature cooled down the sensor response time increased significantly to about 8-10 min or longer at a temperature of 9°C. The influence of hydrogen ion (H+) diffusion in nanostructured RuO2 films on the output emf drift during pH measurements was also investigated.

Paper Details

Date Published: 15 February 2010
PDF: 11 pages
Proc. SPIE 7603, Oxide-based Materials and Devices, 76031I (15 February 2010); doi: 10.1117/12.846255
Show Author Affiliations
Serge Zhuiykov, Commonwealth Scientific and Industrial Research Organisation (Australia)

Published in SPIE Proceedings Vol. 7603:
Oxide-based Materials and Devices
Ferechteh Hosseini Teherani; David C. Look; Cole W. Litton; David J. Rogers, Editor(s)

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