硒化钨(IV)
Tungsten selenide
CAS: 12067-46-8
Molecular Formula: WSe2
硒化钨(IV) - Names and Identifiers
| Name | Tungsten selenide |
| Synonyms | Tungsten selenide TUNGSTEN DISELENIDE TUNGSTEN (IV) SELENIDE |
| CAS | 12067-46-8 |
| EINECS | 235-078-7 |
硒化钨(IV) - Physico-chemical Properties
| Molecular Formula | WSe2 |
| Molar Mass | 341.77 |
| Density | 9.32 |
| Water Solubility | Insoluble in water. |
| Appearance | Powder, 10μm |
| Exposure Limit | ACGIH: TWA 0.2 mg/m3; TWA 3 mg/m3 NIOSH: IDLH 1 mg/m3; TWA 5 mg/m3; TWA 0.2 mg/m3; STEL 10 mg/m3 |
| Storage Condition | Room Temprature |
| MDL | MFCD00049703 |
| Physical and Chemical Properties | Chemical properties Tungsten diselenide is a black or gray solid powder with a molar mass of 341.76g/mol, a hexagonal layered structure of crystals, a density of 9.32g/cm3, and poor thermal conductivity. Its thermal conductivity is about one hundred thousandth of that of diamonds with better thermal conductivity. In addition, the band gap of tungsten selenide (WSe2) is between wide gap semiconductor and zero band gap graphene, which has excellent electrical and optical properties and high quantum yield. |
| Use | Uses Tungsten diselenide can be well used in photovoltaic equipment and ultra-thin LEDs, and it can also be used as an additive for lubricants. |
硒化钨(IV) - Risk and Safety
| UN IDs | UN3283 - class 6.1 - PG 3 - EHS - Selenium compound, solid, n.o.s., HI: all (not BR) |
| RTECS | YO7714000 |
| TSCA | Yes |
| Hazard Class | 9 |
硒化钨(IV) - Introduction
Scientists have discovered. The thermal conductivity of tungsten diselenide (WSe2) is about one -100,000 of that of diamonds with the best thermal conductivity, and it is the material with the lowest thermal conductivity in the world. The thermal conductivity of tungsten diselenide films is worse than that of single crystal tungsten diselenide. It is only about one -100,000 of the diamonds with the best thermal conductivity. This new material not only has the thermal conductivity of a porous substance. More importantly, it's very dense. Probably similar to copper. In application. The low thermal conductivity of the material means that the heat in the system is not easily lost. In other words, the energy conversion efficiency of the system will be higher. Therefore, the application of this new material. It is likely that the efficiency of energy use will be greatly improved.
Last Update：2022-10-16 17:30:07
硒化钨(IV) - Nature
| Exposure Limits | ACGIH: TWA 0.2 mg/m3; TWA 3 mg/m3 NIOSH: IDLH 1 mg/m3; TWA 5 mg/m3; TWA 0.2 mg/m3; STEL 10 mg/m3 |
Last Update：2024-04-10 22:29:15
硒化钨(IV) - Uses and synthesis methods
structural characteristics
Tungsten diselenide (tungsten selenide) is an inorganic compound with the molecular formula WSe2. Tungsten diselenide has a hexagonal structure similar to molybdenum disulfide. Each tungsten atom is covalently bonded to six selenium. It is bonded in a triangular prism coordination mode, and each selenium is in a pyramid-like configuration and three tungsten bonds. The bond length between tungsten and selenium is 2.526 Å, and the bond length between selenium and selenium is 3.34 Å. The layers are combined by van der Waals.
Production method
tungsten diselenide WSe2 can be obtained by reacting tungsten with stoichiometric selenium powder in a vacuum sealed quartz tube at 600~700 ℃.
Last Update：2024-04-10 22:29:15
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CAS: 12067-46-8
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CAS: 12067-46-8
Tel: 18301782025
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Mobile: 18021002903
QQ: 3008007409
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