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Title: Thin films for smart windows : synthesis of temperature-responsive vanadium oxide for energy-efficient glazing applications
Author: Malarde, Delphine
ISNI:       0000 0004 8500 5010
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2019
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The material presented in this thesis highlights different ways of producing temperature-responsive monoclinic VO2 [VO2(M)] for energy-efficient glazing applications, and the improvement of their thermochromic properties. VO2(M) has been widely studied due to its specific thermochromic properties, which make it a promising material to use in home and commercial façade glazing for reducing energy consumptions. VO2(M) thin films were deposited on glass substrate using atmospheric chemical vapour deposition (APCVD) - a well-known deposition process commonly used in industry. The thermochromic properties of the films were optimised, which resulted in a doubling of the visible light transmittance (TLUM) and a fivefold increase in the solar modulation efficiency (ΔTSOL). Further improvements of the thermochromic properties were carried out by the synthesis of VO2-based multilayers. Aerosol-assisted chemical vapour deposition (AACVD) was also used to produce VO2(M) thin films from a newly produced vanadium alkoxide precursor. Furthermore, this precursor showed to be ideal for the formation of V2O3 films with bixbyite structure, which had interesting gas sensing properties. This is the first time that bixbyite-type V2O3 has been synthesised as thin films using AACVD. Finally, continuous hydrothermal flow synthesis (CHFS), a lab-scale process that showed promising results for the production of nanoparticles (NPs) at semi industrialscale, was used to synthesize VO2(M) NPs. The direct synthesis of phase-pure monoclinic VO2 was achieved for the first time, with an average particle size smaller than 40 nm.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available