Abstract
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
In this work, a solid‐state potentiometric pH sensor is designed by incorporating a thin film of Radio Frequency Magnetron Sputtered (RFMS) Titanium Nitride (TiN) working electrode and a commercial Ag|AgCl|KCl double junction reference electrode. The sensor shows a linear pH slope of −59.1 mV/pH, R2 = 0.9997, a hysteresis as low as 1.2 mV, and drift below 3.9 mV/hr. In addition, the redox interference performance of TiN electrodes is compared with that of Iridium Oxide (IrO2) counterparts. Experimental results show −32mV potential shift (E0 value) in 1 mM ascorbic acid (reducing agent) for TiN electrodes, and this is significantly lower than the −114 mV potential shift of IrO2 electrodes with sub‐Nernstian sensitivity. These results are most encouraging and pave the way towards the development of miniaturized, cost‐effective, and robust pH sensors for difficult matrices, such as wine and fresh orange juice.
RAS ID
32614
Document Type
Journal Article
Date of Publication
2021
Volume
21
Issue
1
School
Electron Science Research Institute / School of Science
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Publisher
MDPI
Comments
Paul Shylendra, S., Lonsdale, W., Wajrak, M., Nur-E-Alam, M., & Alameh, K. (2021). Titanium nitride thin film based low-redox-interference potentiometric pH sensing electrodes. Sensors, 21(1), article 42. https://doi.org/10.3390/s21010042