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Gonçalves, Rosana F.
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article
Smart optically active VO2 nanostructured layers applied in roof-type ceramic tiles for energy efficiency
Abstract
<p>The capability to control in an smart way the infrared reflectance to environmental temperature variations can be achieved with thermochromic materials like VO<sub>2</sub>. In this paper, we report the application of VO<sub>2</sub> on ceramic tiles aiming to control the reflected infrared radiation on smart roofs and thus improving the energy efficiency, which is associated to the reduction of the carbon dioxide emissions. The VO<sub>2</sub> nanoparticles have been produced by hydrothermal synthesis assisted by microwave irradiation, providing a new, quicker and cleaner production route. Afterwards, the VO<sub>2</sub> nanoparticles were transferred to the surface of ceramic glassy tiles, which were prepared through dispersing the nanopowders in water and followed by spray coating with posterior annealing treatments in order to promote the surface adhesion as well as the stabilization of the material monoclinic phase. The VO<sub>2</sub> transition temperature was controlled by doping with tungsten and a reduction from 69 °C to 49 °C was achieved. The superior thermochromic characteristics of VO<sub>2</sub> nanoparticles in conjunction with this new application to a smart roof offers a great potential to regulate the energy in an intelligent way.</p>