Interdigitated array microelectrodes as electrochemical sensors

Morita, Masao; Niwa, Osamu; Horiuchi, Toshihisa

doi:10.1016/s0013-4686(97)00171-0

Cited by 99 publications

(62 citation statements)

References 28 publications

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“…Therefore, the relationship between the geometrical parameters of the interdigitated microelectrode arrays and the redox cycling efficiency has been extensively investigated in both stationary [8][9][10] and flow systems [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Theoretical treatment and computer simulation of microelectrode arrays

Morf¹,

Koudelka‐Hep²,

Rooij³

2006

Journal of Electroanalytical Chemistry

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New relations for and interrelations between the current responses of different microelectrode arrays are presented. Interdigitated microelectrode arrays (IDAs: alternating cathodes and anodes) and uniform microband electrode arrays (MEAs: only cathodes or anodes) are treated, and miniaturized systems with planar band electrodes or hemicylinder electrodes are discussed. A common basis was found for the specific response characteristics of IDAs and MEAs. The theoretical expressions were verified by results from computer modelling. The numerical simulations made use of finite-element procedures to evaluate steady-state and time-dependent mass fluxes and concentration profiles of electroactive species at the surfaces of different microelectrode arrays. It was shown that the response behavior of a given array can be exactly predicted from the current data of other arrays.

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Section: Introductionmentioning

confidence: 99%

Theoretical treatment and computer simulation of microelectrode arrays

Morf¹,

Koudelka‐Hep²,

Rooij³

2006

Journal of Electroanalytical Chemistry

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show abstract

“…Since the IDA microelectrodes have various advantages concerning their ability to enhance the current response, and offer higher sensitivity than the macro-electrode, they had been used in a variety of electrochemical applications for development of sensors [24,25]. In this experiment, one segment of the IDA was used to generate bromine (generator electrode) while another was used as the collector electrode at which bromine is reduced.…”

Section: Indirect Electrochemical Determination Of Nh 4 + At An Ida Pmentioning

confidence: 99%

Study on the Indirect Electrochemical Detection of Ammonium Ion with In Situ Electrogenerated Hypobromous Acid

2008

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The mechanism on the electrochemical oxidation of bromide in the presence of ammonium ion was studied by cyclic voltammetry and in-situ UV-Vis spectroscopy. The results indicated that the anodically generated bromine (Br 2 ) would be hydrolyzed to hypobromous acid (HBrO) at the pH range of 5 -7 and was further disproportionate to hypobromite anion (BrO -) when pH was large than 7. Both HBrO and BrO -were confirmed to be participated in the following homogeneous chemical reaction with the ammonium ion co-existed in the electrolytic solution. However, HBrO is electroactive whereas BrO -is electroinactive at carbon electrode. Based upon the reaction of HBrO with ammonium ion, an indirect electrochemical method was proposed for determination of ammonium ion at pH 7 with dual-electrode configuration, where HBrO was produced at a generator electrode and the excess HBrO was subsequently detected at a collector electrode after a reaction with ammonium ion. It was demonstrated that ammonium ion concentrations were proportional to the decreasing of reduction current at the collector electrode either in a batch solution or in a micro flow injection analytical (micro-FIA) system using an interdigitated array (IDA) Pt microelectrode and a carbon film ring-disk electrode (CFRDE), with the detection limit below 3 Μ. This approach shows the advantage of highly selectivity even in presence of a large amount of co-existed cations.

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“…4 The miniaturized sizes of these devices have been exploited in many applications, such as lab-on-a-chip systems, [5][6][7][8][9] a scanning electrochemical microscope (SECM), 10 analysis in a single biological cell 11 and so on. The interdigitated array (IDA) electrode involves one of the most effective structures to improve the sensitivity in detecting electroactive species through a redox cycling mechanism.…”

Section: Introductionmentioning

confidence: 99%

Redox Cycling Effect on the Surface-enhanced Raman Scattering Signal of Crystal Violet Molecules at Nanostructured Interdigitated Array Electrodes

2010

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experimental Materials and apparatusGlass substrates (24 × 24-mm-square and 0.5-mm-thick) were purchased from Matsunami, Ltd. Japan for electrode fabrication. Nanostructured interdigitated array (IDA) electrodes with different inter-electrode spacing were demonstrated to improve the detection sensitivity of short-lived electroactive species and to follow interfacial dynamics by their surface-enhanced Raman scattering (SERS) functionality. Nanostructured IDA electrodes fabricated using electron beam lithography were used for an electrochemical SERS study of irreversible electroactive species, crystal violet (CV), in an aqueous KCl solution in single and generation-collection (GC) mode experiments. The GC mode enabled us to amplify the SERS intensity. An inter-electrode spacing dependent study found the maximum number of redox cycling, collection efficiency and amplification of the SERS intensity. Its SERS function disclosed the potential-dependent dynamics of CV molecules at the electrode surface, which was not observed in the redox current. Miniaturized nanostructured IDA electrodes are of great importance for developing lab on chip devices, and are useful for analyzing dynamical features within small space/volume domains, which require small amounts and/or concentration of analytes.

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Interdigitated array microelectrodes as electrochemical sensors

Cited by 99 publications

References 28 publications

Theoretical treatment and computer simulation of microelectrode arrays

Theoretical treatment and computer simulation of microelectrode arrays

Study on the Indirect Electrochemical Detection of Ammonium Ion with In Situ Electrogenerated Hypobromous Acid

Redox Cycling Effect on the Surface-enhanced Raman Scattering Signal of Crystal Violet Molecules at Nanostructured Interdigitated Array Electrodes

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