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Title: Chemical vapour deposition of gold nanoparticles and metal oxide composites
Author: Chew, C. K. T.
ISNI:       0000 0004 8503 9472
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2016
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Aerosol-assisted chemical vapour deposition (AACVD) is a well-known method for synthesising metal oxide thin films on glass. The primary metal oxide presented here is SnO2 for its transparent conducting oxide (TCO) properties. Its fluorine doped form is an established TCO and widely deposited as a window coating. The versatility of the AACVD method is displayed in this thesis with results of the facile deposition of gold nanoparticles (AuNPs). AuNPs are another useful class of materials but in this thesis the interest is mainly in their surface plasmon resonance (SPR) absorption. Composites of fluorine doped SnO2 and AuNPs were synthesised, allowing the successful combination of the optical and electronic characteristics in one material. The SPR of AuNPs, which gives them their pink and purple colouring, depends on many factors including size, shape and the refractive index of the surrounding medium. Using AACVD, AuNPs were then further layered into composites with other metal oxides, including TiO2, Al2O3, Ga2O3, ZnO and MgO. Ellipsometric measurements were performed on the metal oxides in order for their refractive index to be calculated and these were compared to the shifts in the SPR that were observed. AACVD can also deposit AuNPs onto glass (silica) wool as well as on flat float glass. These were shown to be active as catalysts in the selective oxidation of benzyl alcohol. A wide range of functional materials have been synthesised and analysed in this thesis. New materials with interesting properties can be made from creating composites. This thesis shows that AACVD is capable of synthesising compounds and structures applicable for many devices.
Supervisor: Parkin, I. P. ; Carmalt, C. J. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available