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Publication Detail
A combined experimental and theoretical study into the performance of vanadium dioxide nanoparticles for energy saving applications
  • Publication Type:
    Conference presentation
  • Publication Sub Type:
  • Authors:
    Sol CWO, Portnoi M, Schlaefer J, Malarde D, Powell M, Li T, Parkin IP, Papakonstantinou I
  • Date:
  • Name of Conference:
    MRS Spring 2017
  • Conference place:
    Phoenix, AZ
  • Conference start date:
  • Conference finish date:
  • Addresses:
    Ioannis Papakonstantinou,
    University College London,
    Department of Electronic & Electrical Engineering,
    Torrington Place,
    WC1E 7JE,
    United Kingdom,
In the built environment there is a increasing issue of heat management, with buildings expending significant energy resources to maintain comfortable living temperatures. In many parts of the world, this entails the use of both heating and cooling during daylight hours depending on ambient temperatures. Due to the variation in the desired temperature control, classical solutions can become counter productive in their aim of maintaining comfortable temperatures, therefore it is important to employ adaptive solutions that vary their functionality based on circumstance. Here, we present a model for the design of thermochromic smart windows based on the phase change properties of vanadium dioxide (VO2) nanoparticles embedded in a dielectric film and use these simulations to guide measured results with simulation. In recent years vanadium dioxide has generated a broad range of interest due to its heat-mediated structural phase transition from a semiconductor to a metal, which occurs at a critical temperature that may be tuned via doping. The phase transition of vanadium dioxide significantly modulates its optical properties, with the high temperature metallic state absorbing considerably more infrared radiation than the lower temperature monoclinic state due to a reduction in band-gap energy; a window coated with a composite nanoparticle film may passively vary its transmission of infrared radiation based on the ambient temperature, in doing so reducing the temperature management energy-load. In comparison to thin film deposited VO2, VO2-dielectric composite films exhibit higher transmission of visible light and may be retrofitted to existing windows. The model presented combines both finite-difference-time-domain (FDTD) and Monte Carlo ray-tracing to create a hybrid model capable of modelling both micro- and macroscopic properties of a material composite. Uniquely, the use of this technique enables us to model both specular and diffuse transmission, from which we can model the level of haze resulting from the nanoparticles, a property that is often overlooked but very important in nano-particulate window design. Guided by simulation, the nanoparticles are fabricated and a composite is formed to a desired concentration, after which optical measurements are performed and compared with simulated results.
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