Novel diamond microelectrode for pH sensing

authors	Silva, EL; Bastos, AC; Neto, MA; Silva, RF; Ferreira, MGS; Zheludkevich, ML; Oliveira, FJ
nationality	International
journal	ELECTROCHEMISTRY COMMUNICATIONS
author keywords	Diamond; pH-selective microelectrode; HFCVD; Galvanic cell
keywords	GALVANIC CORROSION; ZN/STEEL COUPLE; HIGH-RESOLUTION; FILMS; ZN2+
abstract	A novel diamond based solid-contact pH-selective microelectrode is reported in the paper for the first time. The diamond films were grown on top of sharp tungsten filaments by HFCVD (Hot Filament Chemical Vapor Deposition). The pH sensitivity of the electrode is achieved via oxygen-termination of the diamond surface with RF oxygen plasma. The MEs were calibrated by zero-current chronopotentiometry registering linearity in the pH 2-12 range. The performance of the diamond microelectrode was demonstrated mapping the pH distribution over corroding Zn-Fe model galvanic cell. (C) 2013 Elsevier B.V. All rights reserved.
publisher	ELSEVIER SCIENCE INC
issn	1388-2481
year published	2014
volume	40
beginning page	31
ending page	34
digital object identifier (doi)	10.1016/j.elecom.2013.12.007
web of science category	Electrochemistry
subject category	Electrochemistry
unique article identifier	WOS:000332356600009