Views: 1 Author: Site Editor Publish Time: 2022-11-09 Origin: Site
Cadmium sulfide is an inorganic compound with the chemical formula CdS. There are two kinds of crystals. The α-form is lemon-yellow powder, and the β-form is orange-red powder. It is mainly used for coloring enamel, glass, ceramics, plastics and paints.
CAS No.: 1306-23-6
Chinese name: 硫化镉
English name: Cadmium Sulfide
Molecular formula: CdS
Molecular weight: 144.47600
Melting point: 980oC (subl.)
Solubility: slightly soluble in water, slightly soluble in ethanol, soluble in acid, easily soluble in ammonia water.
Appearance and Properties: Yellow to orange crystalline powder
Cadmium sulfide is mainly used as a pigment for enamel, glass, ceramics, plastic, paint coloring.
Cadmium sulfide and cadmium selenide are used in the manufacture of photoresistors, solar cells, photocatalysts, etc.
Cadmium sulfide (CdS) is an important direct-bandgap wide-bandgap semiconductor material in the II-VI group, which has a wide range of applications in the fields of photoelectric conversion and photocatalysis. Its forbidden band width is about 2.45e V, which is close to the region of yellow light. It can be used to prepare yellow light-emitting tubes and lasers, and to detect high-energy rays. Cadmium sulfide has a strong photoconductive effect and is an excellent window material.
In addition, the research and utilization of cadmium sulfide materials is very broad. It can be drawn into single crystals, can also be prepared into thin films, and can also be prepared into particles—especially nanoparticles and their particle films. And its different utilization forms have their own different characteristics and advantages. For example, single crystal is mainly used to make light-emitting device lasers and detectors that require high material defects; thin-film cadmium sulfide is mainly used as window material for photoconductive devices, etc.; and cadmium sulfide particles and their particle films are low-dimensional The material is mainly to study and utilize its quantum size effect, which can be used to prepare a variety of quantum devices; in addition, cadmium sulfide can also be used as photochemical catalysis, photosensors, high-energy ray detectors, image sensors, storage and electrodes, etc. device material. Therefore, it has broad application prospects in electronics, textiles, robotics, medical and biotechnology, national defense, and industrial control.
Cadmium yellow is widely used for coloring enamel, glass and ceramics. Also used in coatings and plastics industries, and also used as electronic fluorescent materials. Cadmium Yellow is suitable for coloring almost all resins and is translucent in plastics. The light-colored cadmium yellow containing zinc sulfide is used in polyethylene, and the molding processing time should be shortened as much as possible, because zinc sulfide will promote the decomposition of polyethylene plastic and turn green. Cadmium yellow is less stable than cadmium red in the room, and is mostly used in indoor plastic products. Cadmium yellow should not be combined with pigments containing copper or copper salts to avoid the formation of black copper sulfide or green copper sulfate. Cadmium yellow is mixed with blue pigments to get green.
It is extremely hazardous to water, even a small amount of product seeping into the ground can be hazardous to drinking water. Do not discharge the product into the surrounding environment without government permission. Hazardous to organic matter in water.
1. Put H2S gas into a hot solution of cadmium perchlorate acidified with a little perchloric acid, or an aqueous solution of cadmium sulfate acidified with sulfuric acid, and the cubic crystal of CdS can be precipitated.
2. After the cadmium chloride is treated with hydrochloric acid to make it acidic, thioacetamide is added, and the solution is heated to cause precipitation. The CdS obtained by this method is doped with halide ions, and these impurities cannot be removed in the process of washing the product. The obtained CdS is a hexagonal crystal containing halide ions.