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Electroanalytical applications of carbon electrodes
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Patel, Anisha N. (2012) Electroanalytical applications of carbon electrodes. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2680870~S1
Abstract
Carbon materials, such as graphite and conducting diamond, are highly popular for analytical
and electrochemical applications, and fundamental knowledge of heterogeneous electron
transfer is required to understand and optimise applications. In this thesis, the relationship
between the structure of HOPG (Highly Oriented Pyrolytic Graphite) and its electrochemical
behaviour has been thoroughly studied from the macroscale to the nanoscale. With the use
of data collected from a wide range of techniques, spanning voltammetry, electrochemical
imaging and high resolution microscopy, on 5 different grades of basal plane HOPG whose
surfaces vary in defect density, the contribution of edge plane vs. basal plane on the
electrochemical activity of HOPG has been re-examined. The significant body of work
presented herein shows, without doubt, that the basal plane of HOPG is a very active
electrode for Ru(NH)6
3+/2+; Fe(CN)6
4-/3-; the oxidation of the neurotransmitter, dopamine (DA),
and quinones in aqueous solution. This overturns a well-established (textbook) model that
the basal surface is inert, which researchers have assumed for two decades, with
implications that carry over to related sp2 carbon materials, such as graphene and carbon
nanotubes. A second aspect has considered polycrystalline boron-doped diamond (pBDD) to
study neurotransmitters, such as DA and serotonin (5-HT). The electrode surface was found
to be resistive towards permanent surface blocking during the electrochemical oxidation of
these neurotransmitters. The properties of the film formed by 5-HT oxidative products, was
thoroughly investigated using voltammetry and high resolution microscopy. It is shown, for
the first time, that electro-oxidation of 5-HT results in an electrically insulating, but charged
and porous film, but procedures are demonstrated that allow the pBDD to be renewed in-situ
for precise electroanalysis.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Electrochemical analysis, Electrodes, Carbon -- Analysis | ||||
Official Date: | September 2012 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Chemistry | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Unwin, Patrick R.; Macpherson, Julie V. | ||||
Extent: | xx, 161 leaves : illustrations. | ||||
Language: | eng |
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