
Tungsten oxide, as the core “secret weapon” of smart windows, is like a bright star in the field of materials science, shining with a unique light. Its chemical formula is WO?-x, which is a compound formed by the close combination of tungsten and oxygen. Its appearance presents a variety of colors, the most common of which are light yellow, yellow, orange-yellow, blue and purple, as if it was given a unique color code by nature. From the physical properties, tungsten…