Mo-doped WO3 nanowire can be used to prepare an electrochromic film, which may be applied to smart buildings for high thermal insulation. Some experts have prepared a high-quality Mo-doped WO3 ultra-fine nanowire with a diameter of about 3nm which is oriented by nano-crystals by a low-temperature atmospheric method. These nanowires are uniformly dispersed in water to form stable nano-ink.

Nest-like WO3•0.33H2O may be used to prepare an electrochromic film and then be used to produce a smart window - an energy-saving window that provides the function of thermal insulation, anti-glare and UV resistance. Specifically, some experts have prepared a nest-like hydrated tungsten trioxide electrochromic film on a FTO conductive substrate by a self-seeding hydrothermal method.

Tungsten trioxide may be used to prepare a construction film with excellent thermal insulation properties and light transmission properties. Also, such heat insulation film is environmentally friendly and non-polluting. According to experts, such energy-saving film is obtained by nano-technology to uniformly sputter a high temperature resistant and extremely stable tungsten oxide material onto a high tension PET substrate.

Nano WO3 can be used to prepare a smart window. The tungsten trioxide nanoparticles exist on the smart glass in the form of an electrochromic film (as an EC layer), which has the characteristics of stable performance and good optical adjustment. Finally, such glass can play the role of heat insulation and heat preservation on buildings or autos.