Smart optically active VO2 nanostructured layers applied in roof-type ceramic tiles for energy efficiency

• The microwave synthesis route showed to be innovative to the production of VO2.
• A clean and low cost technique to deposit the nanostructures has been reported and showed to be effective with full covering of the tiles.
• A significant VO2 transition temperature reduction was tuned by doping with tungsten.
• Thermochromic VO2 is a promising material for energy efficiency smart roof.

The capability to control in an smart way the infrared reflectance to environmental temperature variations can be achieved with thermochromic materials like VO2. In this paper, we report the application of VO2 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 VO2 nanoparticles have been produced by hydrothermal synthesis assisted by microwave irradiation, providing a new, quicker and cleaner production route. Afterwards, the VO2 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 VO2 transition temperature was controlled by doping with tungsten and a reduction from 69 °C to 49 °C was achieved. The superior thermochromic characteristics of VO2 nanoparticles in conjunction with this new application to a smart roof offers a great potential to regulate the energy in an intelligent way.

This paper combines the development of thermochromic VO2 nanostructures by microwave irradiation to be applied in regular ceramic tiles, aiming thus to control the reflected infrared radiation on smart roofs and improving the energy efficiency. By heating up the regular ceramic and the coated tile and observe them using a thermal imaging system, we could analyse how the thermochromic film reflects the IR radiation.Figure optionsDownload as PowerPoint slide