Redox cycling with facing interdigitated array electrodes as a method for selective detection of redox species.

Redox cycling with facing interdigitated array electrodes as a method for selective detection of redox species. Research Abstract Details 

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Redox cycling with facing interdigitated array electrodes as a method for selective detection of redox species. Abstract Text:

V A T Dam,W Olthuis,A van den Berg,

A pair of interdigitated ultramicroelectrodes (UMEs) is used to electrochemically detect a weak reductor (dopamine) in the presence of a stronger one (K(4)[Fe(CN)(6)]). In the mixture of both reductors, one of the two interdigitated electrodes (the generator electrode) is used to oxidize both species at 700 mV vs. Ag/AgCl, followed by subsequent (selective) reduction of the oxidized dopamine at 400 mV. A regenerated dopamine molecule can thus be oxidized several times (redox cycling) and enable selective detection even in the presence of the stronger reductor. In order to obtain high redox cycling efficiency, we designed and realized platinum electrodes with widths of 2 and 4 microm and spacing of 2 microm, which gave redox cycling efficiencies of 9 and 4 respectively. Using this electrode design, a dopamine/K(4)[Fe(CN)(6)] selectivity of 2 could be obtained.

Redox cycling with facing interdigitated array electrodes as a method for selective detection of redox species. Publishing Authors By Initials

VA Dam,W Olthuis,A van den Berg,

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Redox cycling with facing interdigitated array electrodes as a method for selective detection of redox species. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: The Analyst

VOLUME: 132

Page Numbers: 365-70

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ISSN: 0003-2654

DAY: 26

MONTH: 01

YEAR: 2007

Redox cycling with facing interdigitated array electrodes as a method for selective detection of redox species. Information

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LANGUAGE: eng

NlmUniqueID: 372652

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AFFILIATION: BIOS, the Lab-on-a-Chip group, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. v.a.t.dam@tue.nl

Country: England

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MEDLINETA: Analyst

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