What is nano tungsten trioxide?
Nano tungsten trioxide powder is an oxide composed of transition metal tungsten elements and non-metallic oxygen elements. It is an ultrafine yellow powder with positive hexavalent tungsten (W6+) and negative divalent oxygen ions (O2-). The chemical formula is WO3, the molecular weight is 231.85, and the CAS number is 1314-35-8.
Characteristics of Nano Tungsten Trioxide
The crystal structure of nanometer WO3 powder is closely related to the temperature: when it exceeds 740 ° C, it is a tetragonal system. When the temperature is 330 ° C to 740 ° C, it is an orthogonal system; when the temperature is 17 ° C to 330 ° C, it is a monoclinic crystal system, and when the temperature is - 50 ° C to 17 ° C, it is a triclinic system. The monoclinic crystal system is the most common structure, and its space group is P21/n.
There are many kinds of shapes of nanoWO3 powder, such as nanoflakes, Nanoflower, hollow nanospheres, ordinary nanoparticles, sea urchin-like nanoparticles, nanowires, mesoporous nanomaterials, etc. They all 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, oxidation, good gas sensitivity, photochromism, and electrochromism.
One of the main characteristics of nano tungsten trioxide is its high stability and durability. Unlike many other materials, it does not easily degrade over time, making it an ideal choice for long-term applications. In addition, its high thermal stability makes it suitable for use in high-temperature environments, making it very suitable for use in various energy and electronic applications.
Another important feature of nano tungsten trioxide is its excellent conductivity. The material has high electron mobility and is very suitable for electronic equipment. In addition, its good conductivity makes it an excellent candidate for producing solar cells, which can be used to convert sunlight into electricity.
In addition to its electrical properties, nano tungsten trioxide has excellent optical properties. It has high transparency in the visible light region, making it an ideal choice for use in display technology. Its high light absorption also makes it suitable for use in solar cells, which can help improve the efficiency of the energy conversion process.
Nano-tungsten trioxide has also shown great hope in environmental protection applications. For example, it can purify water by removing harmful pollutants such as metals and organic pollutants. The material is also being studied for potential use in removing pollutants from the air, as it can effectively adsorb volatile organic compounds.
The production process of nano WO3 powder: First, high-purity ammonium para tungstate is dissolved in water, then the citric acid solution is added while stirring, and then ammonia water is added. Then, it is concentrated in an evaporation container, dried to obtain the precursor, and finally crushed and subjected to aerobic heat treatment.
Nano-tungsten trioxide powder can be used in catalysis, sensors, coatings, glass, batteries, etc. 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 coatings, it can improve the insulation and UV resistance of the product; When used as an additive for electrode materials, it can improve the endurance and service life of energy storage batteries.
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