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Electrochemical impedance spectroscopy at single-walled carbon nanotube network ultramicroelectrodes

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Dumitrescu, Ioana, Unwin, Patrick R. and Macpherson, Julie V. (2009) Electrochemical impedance spectroscopy at single-walled carbon nanotube network ultramicroelectrodes. Electrochemistry Communications, Vol.11 (No.11). pp. 2081-2084. doi:10.1016/j.elecom.2009.08.057

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Official URL: http://dx.doi.org/10.1016/j.elecom.2009.08.057

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Abstract

Electrochemical impedance spectroscopy (EIS), coupled with chemical vapour deposition (CVD) grown single-walled carbon nanotube (SWNT) network disk-shaped ultramicroelectrodes (UMEs), gives stable, very well-defined and highly reproducible EIS responses for electrolysis of a simple outer sphere redox couple (FcTMA(+/2+)). The resulting EIS data can be fitted accurately using a simple electrical circuit model, enabling information on double-layer capacitance, diffusion coefficient of the electroactive species and the rate constant of ET (k(0)) to be extracted in a single EIS experiment. These values are replicated for a range of mediator concentrations and UME sizes (in the range 25-100 mu m diameter) demonstrating the robustness of the method. These initial studies bode well for impedance based electroanalysis using SWNT network UMEs. (C) 2009 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculty of Science > Chemistry
Library of Congress Subject Headings (LCSH): Ultramicroelectrodes, Nanotubes, Impedance spectroscopy, Charge exchange
Journal or Publication Title: Electrochemistry Communications
Publisher: Elsevier Inc.
ISSN: 1388-2481
Official Date: November 2009
Dates:
DateEvent
November 2009Published
Volume: Vol.11
Number: No.11
Number of Pages: 4
Page Range: pp. 2081-2084
DOI: 10.1016/j.elecom.2009.08.057
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), University of Warwick
Grant number: EP/C518268/1 (EPSRC)

Data sourced from Thomson Reuters' Web of Knowledge

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