Manufacture and application of RuO2 solid-state metal-oxide pH sensor to common beverages

W Lonsdale; M Wajrak; K Alameh

doi:10.1016/j.talanta.2017.12.070

Manufacture and application of RuO₂ solid-state metal-oxide pH sensor to common beverages

Talanta. 2018 Apr 1:180:277-281. doi: 10.1016/j.talanta.2017.12.070. Epub 2017 Dec 22.

Authors

W Lonsdale¹, M Wajrak², K Alameh³

Affiliations

¹ Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia. Electronic address: w.lonsdale@ecu.edu.au.
² School of Science, Edith Cowan University, Joondalup, WA 6027, Australia.
³ Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia.

PMID: 29332811
DOI: 10.1016/j.talanta.2017.12.070

Abstract

A new reproducible solid-state metal-oxide pH sensor for beverage quality monitoring is developed and characterised. The working electrode of the developed pH sensor is based on the use of laser-etched sputter-deposited RuO₂ on Al₂O₃ substrate, modified with thin layers of sputter-deposited Ta₂O₅ and drop-cast Nafion for minimisation of redox interference. The reference electrode is manufactured by further modifying a working electrode with a porous polyvinyl butyral layer loaded with fumed SiO₂. The developed pH sensor shows excellent performance when applied to a selection of beverage samples, with a measured accuracy within 0.08 pH of a commercial glass pH sensor.

Keywords: Beverages; Nafion; RuO(2); Solid-state; Ta(2)O(5); pH-sensor.

MeSH terms

Beverages / analysis*
Electrochemical Techniques / instrumentation
Electrochemical Techniques / methods
Electrodes
Equipment Design
Fluorocarbon Polymers / chemistry
Food Analysis / instrumentation
Food Analysis / methods*
Hydrogen-Ion Concentration
Ruthenium Compounds / chemistry*
Silicon Dioxide / chemistry

Substances

Fluorocarbon Polymers
Ruthenium Compounds
ruthenium dioxide
perfluorosulfonic acid
Silicon Dioxide