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Title: Exploiting the properties of boron doped diamond for electrochemical sensing applications
Author: Ayres, Zoë J.
ISNI:       0000 0004 6423 8579
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2017
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This thesis explores utilising the advantageous electrochemical properties of polycrystalline boron doped diamond (BDD), including low background currents and a wide potential window, for a range of different electroanalytical applications. The newly developed technique Electrochemical X-ray Fluorescence is employed for the quantitative detection of palladium (Pd2+) in the presence of electroactive species relevant to the pharmaceutical industry. Significant improvements on analysis times are achieved by EC-XRF parameter optimisation and consideration of the detection limits required for the end application. Given that the quality of BDD utilised (the amount of sp2 content present) can directly impact on the electrochemical response observed, a new BDD characterisation technique is developed. This involves the electrochemical determination of the surface coverage of quinone groups only present on sp2 carbon. This technique is then applied for the characterisation of diamond films grown via chemical vapour deposition under low pressure conditions, identifying regions across BDD wafers with distinctly different electrochemical properties. A Nernstian BDD pH sensor is also successfully fabricated, capable of operating in both buffered and unbuffered solutions. This is achieved by controllably laser micromachining the BDD surface introducing pH sensitive quinone groups. The resulting sensor is found to be stable in a variety of extreme environments.
Supervisor: Not available Sponsor: Engineering and Physical Sciences Research Council ; Element Six Ltd
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QD Chemistry