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Full Paper
Comparison of Planar and 3-D Interdigitated Electrodes as Electrochemical Impedance Biosensors
Article first published online: 20 SEP 2011
DOI: 10.1002/elan.201100353
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Additional Information
How to Cite
Rana, S., Page, R. H. and McNeil, C. J. (2011), Comparison of Planar and 3-D Interdigitated Electrodes as Electrochemical Impedance Biosensors. Electroanalysis, 23: 2485–2490. doi: 10.1002/elan.201100353
Publication History
- Issue published online: 10 OCT 2011
- Article first published online: 20 SEP 2011
- Manuscript Accepted: 5 AUG 2011
- Manuscript Received: 4 JUL 2011
- Abstract
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Keywords:
- Electrochemical impedance spectroscopy;
- Interdigitated electrodes;
- Geometric capacitance;
- Solution resistance;
- Finite element analysis;
- Conformal transformation
Abstract
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.