Nano particle size tungsten trioxide is a type of near infrared shielding material. In other words, it is a kind of heat-insulating material. With the improvement of people’s living standards, this kind of thermal insulation material will gradually “fly into the common family”. Nano particle size tungsten trioxide powder is also an extremely important photocatalyst, and its catalytic activity is affected by its own crystal structure and microstructure. Therefore, considering the crystal structure and microstructure of tungsten trioxide, the research…