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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 ISSN 1388-2481.
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Official URL: http://dx.doi.org/10.1016/j.elecom.2009.08.057
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 |
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| Divisions: | Faculty of Science, Engineering and Medicine > 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: |
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| 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) |
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