Tungsten Doped Tin Dioxide Sol Nanocrystals Preparation

Tin dioxide is an n-type semiconductor material with good chemical stability and optical anisotropy. It is widely used in gas-sensitive materials, photoelectric materials, lithium-ion battery materials and other fields. By doping, tin dioxide can become semiconductor or conductor, improve its conductivity and spectral selectivity, and expand its application range.

There are many studies on doping tin dioxide. The dopants are mainly some metals and non-metals, including fluorine, nitrogen, antimony, indium, nickel, chromium and zinc. However, there are relatively few reports on tungsten-doped tin dioxide. Some scholars have reported that tungsten-doped tin dioxide nano-thermal insulation coatings have high visible light transmittance, good thermal insulation, good infrared and ultraviolet resistance. However, the process of this method is complex and cumbersome, which is not conducive to production and application. Therefore, it is urgent to find a more effective preparation method of tungsten doped tin dioxide sol nanocrystals.

In view of the shortcomings of the existing technology, the researchers used hydrothermal method to prepare tungsten-doped tin dioxide sol nanocrystals, resulting in superior performance of the final product, which includes the following steps:

0.02 mol stannous oxalate and 0.02 mol oxalic acid were weighed in 100 mL beaker, 60 mL deionized water was added, 0.02 mol concentration of 30% hydrogen peroxide was added in stirring environment, and a transparent solution was formed after 40 minutes; 0.0002 mol tungsten powder was added to the solution; after fully dissolved, the above solution was placed in 100 mL autoclave, and the autoclave was reacted at 180 ℃ for 48 hours; after the reaction was completed, the reaction was reversed. When the product is washed and replaced by ethanol solvent, the grass green tungsten doped tin dioxide sol nanocrystals are obtained. After 30 minutes of ultrasound, a very stable sol state is formed.

The prepared tungsten-doped tin dioxide sol nanocrystals were tested, and the Zeta potential value was -44.7mV, which indicated that the product had good dispersion. The measured solid content of the sample is 5%, which indicates that tungsten doped tin dioxide sol nanocrystals with high dispersion and solid content have been obtained.

Hydrothermal method can prepare tungsten-doped tin dioxide sol nanocrystals more quickly and effectively, without polluting the environment and corrosing the equipment. At the same time, the prepared nanocrystals have good dispersion and high solid content, which can meet the industrial needs well. The materials coated on the substrate can be used as energy-saving materials for windows such as automobiles, airplanes and buildings.

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