Lonsdale Wade, Wajrak Magdalena, Alameh Kamal
Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia.
School of Science, Edith Cowan University, Joondalup, WA 6027, Australia.
Sensors (Basel). 2017 Sep 6;17(9):2036. doi: 10.3390/s17092036.
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.
涂覆有商用氰基丙烯酸酯粘合剂的pH敏感RuO₂电极通常表现出非常低的pH敏感性，并且可以与RuO₂工作电极配对作为差分型pH传感器。然而，这种传感器在实际样品基质中表现不佳。开发了一种采用RuO₂pH敏感工作电极和SiO₂-PVB结修饰的RuO₂参比电极的pH传感器作为替代的高性能解决方案。该传感器在一些常见样品基质中表现出与商用玻璃pH传感器相似的性能，特别是具有55.7 mV/pH的优异pH敏感性、低至2.7 mV的滞后现象以及低于2.2 mV/h的漂移。所开发的传感器结构为开发一种用于各种样品基质中pH分析的简单、经济高效且坚固的pH传感器开辟了道路。
