Elucidating Capacitance and Resistance Terms in Confined Electroactive Molecular Layers
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Other documents of the author: Bueno, Paulo R.; Fabregat-Santiago, Francisco; Davis, Jason J.
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http://dx.doi.org/10.1021/ac303018d |
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Title
Elucidating Capacitance and Resistance Terms in Confined Electroactive Molecular LayersDate
2013Publisher
American Chemical SocietyBibliographic citation
BUENO, P. R.; FABREGAT SANTIAGO, F.; DAVIS, J. J. Elucidating Capacitance and Resistance Terms in Confined Electroactive Molecular Layers. Analytical Chemistry, v. 85, n. 1 (2013), p. 411-417Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/ac303018dVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Electrochemical analyses on confined electroactive molecular layers, herein exemplified with electroactive self-assembled monolayers, sample current contributions that are significantly influenced by additional ... [+]
Electrochemical analyses on confined electroactive molecular layers, herein exemplified with electroactive self-assembled monolayers, sample current contributions that are significantly influenced by additional nonfaradaic and uncompensated resistance effects that, though unresolved, can strongly distort redox analysis. Prior work has shown that impedance-derived capacitance spectroscopy approaches can cleanly resolve all contributions generated at such films, including those which are related to the layer dipolar/electrostatic relaxation characteristics. We show herein that, in isolating the faradaic and nonfaradaic contributions present within an improved equivalent circuit description of such interfaces, it is possible to accurately simulate subsequently observed cyclic voltammograms (that is, generated current versus potential patterns map accurately onto frequency domain measurements). Not only does this enable a frequency-resolved quantification of all components present, and in so doing, a full validation of the equivalent circuit model utilized, but also facilitates the generation of background subtracted cyclic voltammograms remarkably free from all but faradaic contributions. [-]
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Analytical Chemistry, v. 85, n. 1 (2013)Rights
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