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Comparison of Planar and 3‐D Interdigitated Electrodes as Electrochemical Impedance Biosensors
Author(s) -
Rana Sunil,
Page Robin H,
McNeil Calum J.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100353
Subject(s) - electrode , planar , electrical impedance , materials science , biosensor , dielectric , dielectric spectroscopy , optoelectronics , electrochemistry , sensitivity (control systems) , nanotechnology , chemistry , electronic engineering , electrical engineering , computer science , computer graphics (images) , engineering
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.