Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/103393
Title: Electrochemical Impedance Spectroscopy in the Characterisation and Application of Modified Electrodes for Electrochemical Sensors and Biosensors
Authors: Brett, Christopher M. A. 
Keywords: electrochemical impedance spectroscopy; modified electrodes; constant phase element; charge transfer resistance; Warburg impedance; sensors and biosensors
Issue Date: 2022
Publisher: MDPI
Project: UIDB/00285/2020 
Serial title, monograph or event: Molecules
Volume: 27
Issue: 5
Abstract: Electrochemical impedance spectroscopy is finding increasing use in electrochemical sensors and biosensors, both in their characterisation, including during successive phases of sensor construction, and in application as a quantitative determination technique. Much of the published work continues to make little use of all the information that can be furnished by full physical modelling and analysis of the impedance spectra, and thus does not throw more than a superficial light on the processes occurring. Analysis is often restricted to estimating values of charge transfer resistances without interpretation and ignoring other electrical equivalent circuit components. In this article, the important basics of electrochemical impedance for electrochemical sensors and biosensors are presented, focussing on the necessary electrical circuit elements. This is followed by examples of its use in characterisation and in electroanalytical applications, at the same time demonstrating how fuller use can be made of the information obtained from complete modelling and analysis of the data in the spectra, the values of the circuit components and their physical meaning. The future outlook for electrochemical impedance in the sensing field is discussed.
URI: https://hdl.handle.net/10316/103393
ISSN: 1420-3049
DOI: 10.3390/molecules27051497
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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