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

RuO2 pH Sensor with Super-Glue-Inspired Reference Electrode

1
Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia
2
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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Abstract

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

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