title: Effect of ordered mesoporous carbon contact layer on the sensing performance of sputtered RuO2thin film pH sensor.
abstract: The effect of contact layer on the pH sensing performance of a sputtered RuO2thin film pH sensor is investigated. The response of pH sensors employing RuO2thin 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 (-58.4mV/pH), low short-term drift rate (5.0mV/h), low hysteresis values (1.13mV) and fast reaction times (30s), after only 1h 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.
authors.affiliation: Electron Science Research Institute, Edith Cowan University, Joondalup WA 6027, Australia. Electronic address: w.lonsdale@ecu.edu.au.
authors.forename: W
authors.initials: W
authors.lastname: Lonsdale
authors.affiliation: Electron Science Research Institute, Edith Cowan University, Joondalup WA 6027, Australia.
authors.forename: D K
authors.initials: DK
authors.lastname: Maurya
authors.affiliation: School of Natural Sciences, Edith Cowan University, Joondalup WA 6027, Australia.
authors.forename: M
authors.initials: M
authors.lastname: Wajrak
authors.affiliation: Electron Science Research Institute, Edith Cowan University, Joondalup WA 6027, Australia.
authors.forename: K
authors.initials: K
authors.lastname: Alameh
keywords: Contact layer; Ordered mesoporous carbon; PH sensor; R.F. sputtering; RuO(2)