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Uses of polycrystalline boron-doped diamond in electroanalysis
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Hutton, Laura A. (2011) Uses of polycrystalline boron-doped diamond in electroanalysis. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2665768~S1
Abstract
Interest and utilisation of polycrystalline boron-doped diamond (pBDD) as an
electrode material has rapidly grown over the last decade, due to its unique
properties and advantages over other available electrode materials. The possibility
of lower detection limits and an increased range of detectable analytes has seen
pBDD flourish in electroanalysis. Due to its stability at high temperatures, pressures
and acidity, pBDD also has the potential to perform electrochemistry in extreme
conditions. These unique properties, however, make the material difficult to
manipulate in order to produce well defined and reproducible electrodes. Deviations
in electrical and electrochemical responses can also arise from sample to sample, due
to differing synthesis conditions and experimental set-ups.
This thesis aims to characterise pBDD available from a commercial source and
through fabrication of electrodes of various designs, best utilise the material in the
electroanalysis of several species. Characterisation is performed using high
resolution microscopic and spectroscopic techniques which show a heterogeneous
material with negligible levels of non-diamond like carbon and boron concentrations
of at least 1 x 1020 atoms cm-3 throughout. Disc electrodes, fabricated using laser
machining, are electrochemically characterised showing low background currents,
wide solvent windows and close to reversible behaviour for Ru(NH3)6
3+/2+, IrCl6
2-/3-
and Fe(CN)6
3-/4. Functionalisation of these pBDD disc electrodes with nanoparticles
enables the detection of dissolved oxygen and glucose to detection limits of ~ ppb.
Furthermore, the fabricated electrodes are used in the study of Pb deposition and
stripping behaviour at a pBDD surface, as well as Pb2+ detection. The last chapter in
this thesis details the next step in diamond electrode development; the fabrication of
all-diamond electrodes, where the pBDD is insulated with intrinsic diamond. Two
electrode geometries are described, the first being a tubular flow ring electrode
which has well-defined hydrodynamics and is used in the detection of dopamine.
The second all-diamond geometry is a dual band electrode which it utilised as a
solution conductivity sensor.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Boron, Diamond, Semiconductor doping, Electrochemistry, Polycrystalline semiconductors, Electrochemical analysis | ||||
Official Date: | April 2011 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Chemistry | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Macpherson, Julie V. | ||||
Extent: | xx, 206 leaves : illustrations. | ||||
Language: | eng |
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