Tungsten sulfide , 99.9%metalsbasis,25μm , 12138-09-9

Synonym(s):
Tungsten disulfide;Tungsten sulfide;Tungsten sulphide;Tungsten(IV) sulfide;WS₂ flakes

CAS NO.：12138-09-9

Empirical Formula: S2W

Molecular Weight: 247.97

MDL number: MFCD00011467

EINECS: 235-243-3

PRODUCT Properties

• Melting point: 1480 °C
• Density: 7.5 g/mL at 25 °C(lit.)
• RTECS: YO7716000
• solubility: insoluble in H2O, HCl, alkaline solutions
• form: powder
• color: Dark gray
• Specific Gravity: 7.5
• Water Solubility: Slightly soluble in water.
• Crystal Structure: MoS2 type
• crystal system: Six sides
• Space group: P63/mmc
• Lattice constant:
  • a/nm: 0.31532
  • b/nm: 0.31532
  • c/nm: 1.2323
  • α/o: 90
  • β/o: 90
  • γ/o: 120
  • V/nm3: 0.1061
• Exposure limits: ACGIH: TWA 3 mg/m3; NIOSH: TWA 5 mg/m3; STEL 10 mg/m3
• CAS DataBase Reference: 12138-09-9(CAS DataBase Reference)
• EPA Substance Registry System: Tungsten sulfide (WS2) (12138-09-9)
• Bandgap: 1.4 - 2.01 eV
• Electronic properties: 2D semiconductor

Description and Uses

Few-layer?tungsten disulfide (WS2) film has a 2D-layered structure with a narrow indirect bandgap of of 1.35 eV. In contrast, the monolayer film possesses a direct bandgap of 2.1 eV.

Tungsten sulfide is used as a component of catalysts for hydrotreating of crude oil, hydrodesulfurization and hydrodenitrification reactions. It finds application as solid-state secondary lithium battery cathodes and other electrochemical devices. It is found that it forms inorganic nanotubes, which is better reinforcing agents than carbon nanotubes. Tungsten sulfide addition to epoxy resin improves adhesion, fracture toughness and strain energy release rate.

Safety

• Symbol(GHS): GHS07
• Signal word: Warning
• Hazard statements: H315-H319-H335
• Precautionary statements: P261-P305+P351+P338
• Hazard Codes: Xi
• Risk Statements: 36/37/38
• Safety Statements: 26-37/39
• WGK Germany: -
• TSCA: Yes
• HS Code: 28291900