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

Sunil Rana*, Robin H. Page, Calum J. Mcneil

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2485-2490
Number of pages6
JournalElectroanalysis
Volume23
Issue number10
DOIs
Publication statusPublished - Oct 2011

Keywords

  • Conformal transformation
  • Electrochemical impedance spectroscopy
  • Finite element analysis
  • Geometric capacitance
  • Interdigitated electrodes
  • Solution resistance

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