Title

Effect of ordered mesoporous carbon contact layer on the sensing performance of sputtered RuO2 thin film pH sensor

Document Type

Journal Article

Publisher

Elsevier

School

School of Natural Sciences / Electron Science Research Institute

RAS ID

22862

Comments

Originally published as: Lonsdale,W. ,Maurya,D. ,Wajrak,M. ,Alameh,K.(2016). Effect of ordered mesoporous carbon contact layer on the sensing performance of sputtered RuO2 thin film pH sensor. 164(1), 52 - 56. Original article available here

Abstract

The effect of contact layer on the pH sensing performance of a sputtered RuO2 thin film pH sensor is investigated. The response of pH sensors employing RuO2 thin film electrodes on screen-printed Pt, carbon and ordered mesoporous carbon (OMC) contact layers are measured over a pH range from 4 to 10. Working electrodes with OMC contact layer are found to have Nernstian pH sensitivity (−58.4 mV/pH), low short-term drift rate (5.0 mV/h), low hysteresis values (1.13 mV) and fast reaction times (30 s), after only 1 h of conditioning. A pH sensor constructed with OMC carbon contact layer displays improved sensing performance compared to Pt and carbon-based counterparts, making this electrode more attractive for applications requiring highly-accurate pH sensing with reduced conditioning time.

DOI

10.1016/j.talanta.2016.11.020

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