Title

RuO2 pH sensor with super-glue-inspired reference electrode

Document Type

Journal Article

Publisher

M D P I AG

Place of Publication

Switzerland

School

School of Science / Electron Research Insititute

Comments

Originally published as: Lonsdale, W., Wajrak, M., & Alameh, K. (2017). RuO2 pH Sensor with Super-Glue-Inspired Reference Electrode. Sensors, 17(9), 2036. Article available here.

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.

DOI

10.3390/s17092036

Access Rights

Open access

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