Hexagonal tungsten trioxide is important for preparing transparent thermal insulation material such as WO3 film and WO3 coating. Also, it is a significant anodic material of Li-ion batteries. So, WO3 is more and more well-known. Well, do you know how to prepare hexagonal tungsten trioxide? Some researchers have successfully prepared single-crystal nanowires of hexagonal tungsten trioxide (h-WO3) in a large scale by a simple hydrothermal method without any templates and catalysts. The prepared h-WO3 nanowires are uniform with diameter of 25–50 nm and length of up to several micrometers.

As a near-infrared shielding material, tungsten oxide film is more and more well known, and tungsten oxide has therefore attracted much attention from scholars and researchers. According to the experts, the valence of tungsten in this tungsten oxide film includes W6+ and W5+.

Cesium tungsten bronze, or CsxWO3, is a well-known near infrared absorbing material having excellent visible light transmission and near-infrared shielding properties, which stands out from near-infrared absorbing materials such as ATO, ITO, rare earth hexaboride, TiN, and VO2. But do you know why cesium tungsten bronze is the most popular near-infrared absorbing material?

Cesium tungsten bronze, or CsxWO3, is often used to prepare near-infrared absorbing materials such as transparent heat-insulating film and transparent heat-insulating coating. And these near-infrared absorbing materials are often applied to produce transparent heat insulation window to reduce energy consumption for air-conditioning refrigeration. To date, researchers have developed antimony-doped tin oxide (ATO), indium-doped tin oxide (ITO), rare earth hexaboride (ReB6), titanium nitride (TiN), vanadium dioxide (VO2), tungsten bronze compounds with the formula of MxWO3 (M = Tl, Na, K, Rb, Cs; 0 <x≤0.33) and other near-infrared absorbing materials.