Nano tungsten trioxide is an inorganic substance with the chemical formula WO3 and the appearance of light yellow powder. It has the following main properties and applications:
- Basic properties of nano tungsten trioxide
Solubility of nano tungsten trioxide
Nano tungsten trioxide is insoluble in water, but soluble in alkali, slightly soluble in acid.
Structure change of nano tungsten trioxide
Its structure changes with temperature, such as above 740°C for tetragonal crystal system, 330-740°C for orthorhombic crystal system, 17-330°C for monoclinic crystal system, -50-17°C for triclinic crystal system.
Physical properties of nanometer tungsten trioxide
High specific surface area of nanometer tungsten trioxide
Nano tungsten trioxide has a large specific surface area due to its small particle size, which makes its surface effect significant and gives it special catalytic properties.
Optoelectronic properties of nano tungsten trioxide
As a compound of transition metal, nano tungsten trioxide is a wide bandgap n-type semiconductor, which has strong absorption ability for electromagnetic wave, so it can be used as excellent solar energy absorption material and stealth material.
Application fields of nanometer tungsten trioxide
Photocatalytic field
Nano tungsten trioxide has high photocatalytic stability, and has a better catalytic effect on photocatalytic degradation of pollutants in water. Research shows that nano WO3 has good photocatalytic stability, and can be used in photolysis of water to produce hydrogen, photocatalytic degradation of organic pollutants and other reactions to remove harmful substances in water and improve water quality.
Energy field
In lithium-ion batteries, nano tungsten trioxide as an anode material has high energy density and cycle stability, which is expected to improve the performance of the battery.
Environmental Monitoring
The excellent photoelectric properties of tungsten trioxide nanoparticles make them ideal as sensor materials for detecting pollutant concentrations and harmful gases in the environment.
Biomedical field
Nano tungsten trioxide has a promising application in biomedical field, including biosensing, drug delivery and photothermal therapy. Its good biocompatibility and bioactivity provide possibilities for these applications.
- Preparation Methods
There are various methods for the preparation of tungsten trioxide nanoparticles, among which the sol-gel method is one of the most commonly used. In this method, tungsten oxide nanomaterials are obtained by mixing tungstate and organic matter to form a sol, which is then gelatinized by steps such as heating and drying, and finally calcined. In addition, there are other preparation methods such as hydrothermal method, vapor phase deposition method and electrochemical method available. Each of these methods has its own advantages and disadvantages, and the appropriate method can be selected according to the specific needs.
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