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Sensors 2017, 17(9), 2036; doi:10.3390/s17092036

RuO2 pH Sensor with Super-Glue-Inspired Reference Electrode

Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia
School of Science, Edith Cowan University, Joondalup, WA 6027, Australia
Author to whom correspondence should be addressed.
Received: 8 August 2017 / Revised: 1 September 2017 / Accepted: 4 September 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Solid-State pH Sensors)
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A pH-sensitive RuO2 electrode coated in a commercial cyanoacrylate adhesive typically exhibits very low pH sensitivity, and could be paired with a RuO2 working electrode as a differential type pH sensor. However, such sensors display poor performance in real sample matrices. A pH sensor employing a RuO2 pH-sensitive working electrode and a SiO2-PVB junction-modified RuO2 reference electrode is developed as an alternative high-performance solution. This sensor exhibits a performance similar to that of a commercial glass pH sensor in some common sample matrices, particularly, an excellent pH sensitivity of 55.7 mV/pH, a hysteresis as low as 2.7 mV, and a drift below 2.2 mV/h. The developed sensor structure opens the way towards the development of a simple, cost effective, and robust pH sensor for pH analysis in various sample matrices. View Full-Text
Keywords: ruthenium oxide; solid-state pH sensor; polyvinyl butyral; silicon dioxide; differential-type pH sensor ruthenium oxide; solid-state pH sensor; polyvinyl butyral; silicon dioxide; differential-type pH sensor

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lonsdale, W.; Wajrak, M.; Alameh, K. RuO2 pH Sensor with Super-Glue-Inspired Reference Electrode. Sensors 2017, 17, 2036.

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