| Identification | More | [Name]
TUNGSTEN SELENIDE | [CAS]
12067-46-8 | [Synonyms]
TUNGSTEN DISELENIDE
TUNGSTEN (IV) SELENIDE
TUNGSTEN SELENIDE
TUNGSTEN (IV) SELENIDE, 99.8% (METALS BASIS)
Tungsten(Ⅳ) selenide | [EINECS(EC#)]
235-078-7 | [Molecular Formula]
Se2W | [MDL Number]
MFCD00049703 | [Molecular Weight]
341.76 | [MOL File]
12067-46-8.mol |
| Chemical Properties | Back Directory | [Definition]
Lamellarstructured, dry, solid lubricant with exceptionally high temperature and high vacuum stability. Retains its lubricity to temperatures as low as 265℃.
| [density ]
9.32 | [RTECS ]
YO7714000 | [form ]
Powder, 10μm | [color ]
gray hexagonal, hexane crystals, crystalline | [Water Solubility ]
Insoluble in water. | [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 | [CAS DataBase Reference]
12067-46-8(CAS DataBase Reference) | [EPA Substance Registry System]
Tungsten selenide (WSe2) (12067-46-8) |
| Hazard Information | Back Directory | [Chemical Properties]
-325 mesh black powder(s); dry, solid lubricant with exceptional stability at high temperatures, and in high vacuum; used in the form of 99.8% pure material as a sputtering target to produce lubricant films [HAW93] [CER91] [AES93] | [Hazard]
TLV: 5 mg(W)/m3. | [Uses]
Owing to the thickness dependent physical and chemical properties, the two dimensional layered inorganic nanomaterials have drawn significant attention recently. They find applications in photocatalysis, phtotovoltaics, gas sensing, lithium ion batteries, field effect transistors, spintronics etc. Transition metal dichalcogenides represent an important class of inorganic 2D materials having aforementioned applications. The CVD grown monolayer films of MoS2, MoSe2, WS2 and WSe2 on insulating substrates such as SiO2 and sapphire are well suited for electronic and photovoltaic devices. | [Uses]
The two dimensional layered inorganic nanomaterials have drawn significant attention recently owing to their thickness dependent physical and chemical properties. They find applications in photocatalysis, phtotovoltaics, gas sensing, lithium ion batteries, field effect transistors, spintronics etc. Transition metal dischalcogenides represent an important class of inorganic 2D materials having the aforementioned applications. | [Uses]
Tungsten(IV) selenide is used as an important compound in electrochemical solar cells. It acts as a stable semiconductor. | [Structure and conformation]
Tungsten diselenide, WSe2, has a hexagonal crystalline structure comparable to MoS2. Every tungsten atom is covalently bonded to six selenium ligands in a trigonal prismatic coordination sphere, and each selenium is bonded to three
tungsten atoms in a pyramidal geometry. Heating thin films of tungsten under pressure from gaseous selenium and high
temperatures ( . 527℃/800K) using the sputter deposition technique leads to the films crystallizing in hexagonal structures with the correct stoichiometric ratio.
W+ 2Se→WSe2 |
| Safety Data | Back Directory | [RIDADR ]
UN3283 - class 6.1 - PG 3 - EHS - Selenium compound, solid, n.o.s., HI: all (not BR) | [TSCA ]
Yes | [HazardClass ]
9 |
|
| Company Name: |
Alfa Aesar
|
| Tel: |
400-6106006 |
| Website: |
http://chemicals.thermofisher.cn |
|