Microelectrode-array of IrO2 prepared by thermal treatment of pure Ir

In this paper, the IrO2 electrode preparation technique consisting in thermal treatment of pure Ir in air was used in order to produce an IrO2-based microelectrode-array (TOIROF-MEA) with low capacitive background current. The TOIROF-MEA was characterized using Fe(CN)(6)(4-/3-) as model redox couple. It was found that very low concentrations can be detected; this feature makes TOIROF-MEA suitable for analytical applications. (C) 2010 Elsevier B.V. All rights reserved.