Nano tungsten trioxide powder is an oxide composed of transition metal tungsten elements and non-metallic oxygen elements. It is composed of positive hexavalent tungsten ions (W6+) and negative divalent oxygen ions (O2-). It is an ultrafine yellow powder with chemical formula WO3, molecular weight 231.85, and CAS number 1314-35-8.
The crystal structure of nano-WO3 powder is closely related to temperature: when the temperature exceeds 740°C, it is tetragonal, when it is 330°C to 740°C, it is orthorhombic, and when it is 17°C to 330°C, it is monoclinic The crystal system is triclinic at -50°C to 17°C. Among them, the monoclinic crystal system is the most common structure, and its space group is P21/n. There are many shapes of nano WO3 powder, such as nanosheets, nanoflowers, nanohollow spheres, ordinary nanoparticles, sea urchin-shaped nanoparticles, nanowires, mesoporous nanomaterials, etc., all of which have large specific surface areas or surface defects. .
The physical and chemical properties of nano WO3 powder include high specific surface area, chemical stability, catalytic activity, theoretical specific capacity and oxidation, as well as good gas sensitivity, photochromism and electrochromism.
The production steps of nano-WO3 powder: first dissolve high-purity ammonium paratungstate in water, then add citric acid solution while stirring, then add ammonia water, and then concentrate in an evaporation container, then dry to obtain the precursor, and finally pulverize and perform aerobic heat treatment That’s it.
Nano tungsten trioxide powder can be used in catalysis, sensors, coatings, glass, batteries and other fields. Specifically, when nano-WO3 is used as a catalyst, it can efficiently purify the air and treat wastewater; when used as an additive for glass or paint, it can improve the heat insulation and anti-ultraviolet effect of the product; battery life and battery life.
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