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Chemical Vapour Deposition of Gold Nanoparticles and Metal Oxide Composites

Chew, CKT; (2016) Chemical Vapour Deposition of Gold Nanoparticles and Metal Oxide Composites. Doctoral thesis , UCL (University College London). Green open access

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Abstract

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.

Type: Thesis (Doctoral)
Title: Chemical Vapour Deposition of Gold Nanoparticles and Metal Oxide Composites
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/1485820
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