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Title: Photo-induced changes in metal oxides and their applications as self-cleaning piezoelectric based caesium sensors
Author: Foran, Philip Stephen
Awarding Body: Lancaster University
Current Institution: Lancaster University
Date of Award: 2013
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There is current debate in literature as to the main source of photoinduced super-hydrophilic (PSH) nature on Ti02 films with groups segregated into two schools of thought: (i) those attributing the effect to UV induced modifications of the Ti02 surface; and (ii) those attributing the effect to the well-known photo-oxidation properties of Ti02 in removing hydrophobic organic layers from the Ti02 surface. This thesis presents acquisition of experimental goniometric data required to allow theoretical analysis of the super-hydrophilic nature on as prepared mesoporous-Ti02 (m-Ti02), in order to determine the source of PSH. Evidence to advocate that surface reconstruction does not occur instantaneously upon ultra-band gap illumination, the Ti02 surface is inherently wet with a contact angle, 8, being 4°, and the photo-induced super-hydrophilic nature is due to the latter effect, (ii), is also discussed. Experiments demonstrating the change in the Ti02 surface during UV band-gap illumination in the presence of organics using micro-gravimetric techniques, mainly the quartz crystal microbalance (QCM), are presented and exploration and applications of PSH-related phenomena in real world sensing devices are explored.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available