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Comparison of Planar and 3-D Interdigitated Electrodes as Electrochemical Impedance Biosensors

Lookup NU author(s): Dr Sunilkumar Rana, Dr Robin Page, Emeritus Professor Calum McNeilORCiD


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It has been reported that the introduction of a dielectric barrier between adjacent digits of an interdigitated electrode array can improve the sensitivity of the array as an electrochemical impedance biosensor. Here we present an in-depth analysis of the impedance in planar interdigitated electrodes and 3-D interdigitated electrodes (with dielectric barriers). The analysis indicates that the planar geometry not only provides lower impedance but also a higher change impedance as a result of molecular immobilization on the electrode array surface.

Publication metadata

Author(s): Rana S, Page RH, McNeil CJ

Publication type: Article

Publication status: Published

Journal: Electroanalysis

Year: 2011

Volume: 23

Issue: 10

Pages: 2485-2490

Print publication date: 20/09/2011

ISSN (print): 1040-0397

ISSN (electronic): 1521-4109

Publisher: Wiley - V C H Verlag GmbH & Co. KGaA


DOI: 10.1002/elan.201100353


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Funder referenceFunder name
FP7-2007- ICT-1 IST-2007-2-216031Commission of the European Communities