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Thin films for Smart Windows: Synthesis of Temperature-Responsive Vanadium Oxide for Energy-Efficient Glazing Applications

Malarde, Delphine; (2019) Thin films for Smart Windows: Synthesis of Temperature-Responsive Vanadium Oxide for Energy-Efficient Glazing Applications. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

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.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Thin films for Smart Windows: Synthesis of Temperature-Responsive Vanadium Oxide for Energy-Efficient Glazing Applications
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2019. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) Licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
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/10081863
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