
Nano tungsten oxide may be used to produce thermal insulation coating with excellent photochromic properties. Tungsten oxide is also a type of electrochromic material. It is worth noting that the reversible transformation process of tungsten oxide and tungsten bronze is always accompanied by the transfer of internal electrons and the change of tungsten valence, which will induce a color change reaction and achieve controllable adjustment of transmitted light. This feature was first discovered in 1969 and has since been widely…