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

Document Type

Journal Article

Publication Title

Talanta

Publisher

Elsevier

School

School of Science / Electron Science Research Institute

RAS ID

22862

Comments

Lonsdale,W. ,Maurya,D. ,Wajrak,M. ,Alameh,K.(2017). Effect of ordered mesoporous carbon contact layer on the sensing performance of sputtered RuO2 thin film pH sensor. Talanta,164(1), 52 - 56. https://doi.org/10.1016/j.talanta.2016.11.020

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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