Title

Effect of conditioning protocol, redox species and material thickness on the pH sensitivity and hysteresis of sputtered RuO2 electrodes

Document Type

Journal Article

Publisher

Elsevier

School

Electron Science Research Institute / School of Science

Comments

Originally published as: Lonsdale, W., Wajrak, M., & Alameh, K. (2017). Effect of conditioning protocol, redox species and material thickness on the pH sensitivity and hysteresis of sputtered RuO 2 electrodes. Sensors and Actuators B: Chemical. Original available here

Abstract

In this paper, the effects of conditioning-pH, RuO2 material thickness and oxidizing/reducing agents on the E0 value and hysteresis of RuO2 pH-sensitive working electrodes is investigated. Experimental results show that, in order to obtain a pH sensor that Exhibits 0.01 units of precision, it is necessary to use an electrode with at least 500 nm thickness of RuO2; whilst thinner RuO2 electrodes (> 50 nm) can be used to achieve a precision of 0.05 pH units. In addition, investigation of the redox interference and pH sensing performance of RuO2 electrodes at high/low pH suggests that hysteresis and redox interference are due to shifts in the E0 value due to a change in the electrode’s composition, i.e. the ratio of RuIII to RuIV present in the electrode material.

DOI

10.1016/j.snb.2017.05.171

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