Abstract
The preparation of thermochromic vanadium dioxide (VO2) films in an economical way is of interest to realizing the application of smart windows. Here, we reported a successful preparation of self-assembly VO2 nanoplate films on TiO2-buffered glass by a facile hydrothermal process. The VO2 films composed of triangle-shaped plates standing on substrates exhibit a self-generated porous structure, which favors the transmission of solar light. The porosity of films is easily controlled by changing the concentration of precursor solutions. Excellent thermochromic properties are observed with visible light transmittance as high as 70.3% and solar modulating efficiency up to 9.3% in a VO2 film with porosity of ~35.9%. This work demonstrates a promising technique to promote the commercial utilization of VO2 in smart windows.
Highlights
Crystallization treatment (500–550 °C for hours) were needed during those fabrications to limit their usability in industry
There is no report about using the hydrothermal method to prepare VO2 (M) thin films on glass for smart windows
Our recent work has demonstrated that high quality epitaxial VO2 thin films can be grown on sapphire substrates by hydrothermal method[29]
Summary
The different vanadic precursor solutions mentioned above have no carboxylic group, so there is no effective species to play the role of bridge between vanadium ions and positive charge-terminated surface of the TiO2 thin films for achieving the growth of highly adhesive VO2 films. The sample #1 has the largest porosity of ~54.9%, it suggests that higher T-vis could be achieved Such self-generated porous nanostructures exhibit a good combination property of thermochromism (combining visible light transmittance and solar modulating efficiency). Where Tλ denotes transmittance at wavelength λ, φsol is the solar irradiance spectrum for air mass 1.5 (corresponding to the sun standing 37° above the horizon)[52]
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