Multi-layered water quality sensor based on RuO2 nanostructures

Serge Zhuiykov

doi:10.1117/12.846255

15 February 2010 Multi-layered water quality sensor based on RuO₂ nanostructures

Serge Zhuiykov

Proceedings Volume 7603, Oxide-based Materials and Devices; 76031I (2010) https://doi.org/10.1117/12.846255
Event: SPIE OPTO, 2010, San Francisco, California, United States

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.

Citation Download Citation

Serge Zhuiykov "Multi-layered water quality sensor based on RuO₂ nanostructures", Proc. SPIE 7603, Oxide-based Materials and Devices, 76031I (15 February 2010); https://doi.org/10.1117/12.846255

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KEYWORDS

Sensors

Oxygen

Nanostructuring

Ions

Temperature metrology

Nanostructures

Adsorption

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