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Efficient and environmentally friendly photocatalyst-zinc sulfide

The history of zinc sulfide
The study of ZnS fluorescent materials has a history of more than 130 years since it was discovered by the French chemist Sidot in 1868. From the 1920s to the 1940s, the study of zinc sulfide materials has always attracted people's attention.

Physical properties
White or slightly yellow powder. It turns into crystals when burning in H2S gas. The alpha variant is a colorless hexagonal crystal with a density of 3.98g/cm3 and a melting point of 1700±28°C (202.66 kPa-20 atmospheres); the beta variant is a colorless cubic crystal with a density of 4.102g/cm3, which is converted to at 1020°C α type. Exist in sphalerite.
Chemical properties
Insoluble in water, soluble in acid. See the sunlight dimmed. It is converted into zinc sulfate in humid air for a long time. It is generally derived from the action of hydrogen sulfide and zinc salt solution. If a small amount of Cu, Mn, Ag is added as an activator in the crystalline ZnS, it can emit different colors of fluorescence after being illuminated. Used as analytical reagents, coatings, paints, white and opaque glass, filling rubber, plastics, and for preparing phosphors. It is made by co-heating sulfur and zinc. The relative density is 4.087.
Uses of ZnS
As an important two and six compound semiconductors, zinc sulfide nanomaterials have attracted great attention, not only because of its excellent physical properties, such as wide band gap, high refractive index, and high light transmittance in the visible light range, but also Its huge potential is applied to optics, electronics and optoelectronic devices. Zinc sulfide has excellent fluorescence effect and electroluminescence function. Nano-zinc sulfide has a unique photoelectric effect. It has many excellent properties in the fields of electricity, magnetism, optics, mechanics and catalysis. Therefore, the research of nano-zinc sulfide has caused In 1994, Bhargava reported that the surface passivation of nano-ZnS:Mn phosphor not only has an external quantum efficiency of up to 18% at high temperatures, but also has a fluorescence lifetime shortened by 5 orders of magnitude, and it also emits light. The performance has been greatly changed, which opens up a new way for the application of ZnS in materials. It can be used to make white pigment and glass, luminous powder, rubber, plastic, luminous paint, etc.
Research and develop smart textiles
The research team of the Department of Polymer Science of Fudan University independently developed a fully flexible fabric display system that can "display" information, navigation and other information on textiles. In addition, this fabric has the advantages of being abrasion-resistant, foldable, and machine washable repeatedly.
The research team also doped zinc sulfide fluorescence with different elements, such as copper and manganese, to achieve multi-color light-emitting units and obtain colorful display fabrics. By adjusting the weaving parameters to change the distance between the warp and weft contact points, you can also adjust the density of the light-emitting unit.
This new fabric can be powered by a portable battery. There are many application scenarios for this technology. For example, when the driver's position moves, it can enable the driver to see a dynamic GPS map on the sleeve.
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