12138-09-9

Basic information

• Product Name: TUNGSTEN SULFIDE
• Synonyms: tungsten disuIlfide;Tungsten disulfide, particle size 0.7-1.1 micrometer;Wolfram(IV)disulfide;Tungsten sulfide (metals basis);Tungsten(IV) sulfide powder;Tungsten Disulfide dispersion;Tungsten Disulfide Micro powder;Tungsten Disulfide Nanoparticles
• CAS NO: 12138-09-9
• Molecular Formula: S2W
• Molecular Weight: 247.97
• EINECS: 235-243-3
• Product Categories: Materials Science;Metal and Ceramic Science;Tungsten;metal chalcogenides;Inorganics;ChalcogenidesChemical Synthesis;Catalysis and Inorganic Chemistry
• Mol File: 12138-09-9.mol
• Article Data: 0

Chemical Properties

• Melting Point: 1480 °C
• Appearance: Dark gray/powder
• Density: 7.5 g/mL at 25 °C(lit.)
• Water Solubility: Slightly soluble in water.
• CAS DataBase Reference: TUNGSTEN SULFIDE(CAS DataBase Reference)
• NIST Chemistry Reference: TUNGSTEN SULFIDE(12138-09-9)
• EPA Substance Registry System: TUNGSTEN SULFIDE(12138-09-9)

Safety Data

• Hazard Codes: Xi
• Statements: 36/37/38
• Safety Statements: 26-37/39
• RTECS: YO7716000
• TSCA: Yes
• Hazardous Substances Data: 12138-09-9(Hazardous Substances Data)

Usage

Description

Tungsten sulfide (WS2) is a chemical compound that exists naturally in the form of a rare mineral called tungstenite. It is a grayish-black solid with a melting point above 1480°C and can lubricate at temperatures above 2400°F (1316°C). Tungsten sulfide is attacked by fluorine and hot sulfuric and hydrogen fluoride. It possesses a pseudo 2-dimensional structure and a narrow indirect bandgap of 1.35 eV, while the monolayer film has a direct bandgap of 2.1 eV.
Used in Petrochemical Industry:
Tungsten sulfide is used as a desulfurization catalyst and as a component of catalysts for hydrotreating of crude oil, hydrodesulfurization, and hydrodenitrification reactions.
Used in Lubrication Applications:
Tungsten sulfide is used as a solid lubricant that can withstand high temperatures and as a dry lubricant for fasteners, bearings, and molds under the brand name Dicronite. It is also used as a spray lubricant.
Used in Electrochemical Devices:
Tungsten sulfide is used as solid-state secondary lithium battery cathodes and other electrochemical devices.
Used in Semiconductor Materials and Inorganic Nanotubes:
Tungsten sulfide finds application in semiconductor materials, inorganic nanotubes, and as reinforcing agents better than carbon nanotubes.
Used in Coatings and Adhesives:
The addition of tungsten sulfide to epoxy resin improves adhesion, fracture toughness, and strain energy release rate.
Used in Photodetectors and Multi-Junction Photovoltaics:
Due to its high on/off ratio in field-effect transistors, controllable spin and valley polarisation, strong geometrical confinement of excitons, and tunable photoluminescence, WS2 could lead to increased interest in areas such as photodetectors and multi-junction photovoltaics.
Used in Catalysts for Hydrogen Evolution Reactions (HERs):
Few-layer tungsten disulfide nanosheets have potential applications in electrodes and energy storage devices, supercapacitors, and photoelectrochemical cells as a catalyst for hydrogen evolution reactions.
Used in Electromagnetic Pollution Protection:
With tunable electromagnetic absorption, tungsten disulfide has practical applications against electromagnetic pollution.
Used in Photothermal Therapy for Cancer Treatment:
WS2 is a great potential candidate in photothermal therapy for the ablation of cancer cells when NIR light is absorbed and converted into heat.

References

https://en.wikipedia.org/wiki/Tungsten_disulfide https://www.alfa.com/zh-cn/catalog/011829/ http://www.us-nano.com/inc/sdetail/1030 http://www.azonano.com/article.aspx?ArticleID=3360

Synthesis

High-quality tungsten disulfide monolayer?films?are grown directly on the substrates (sapphire) by? the chemical vapour deposition (CVD) method.

Flammability and Explosibility

Notclassified

InChI:InChI=1/2S.W/q2*-2;+4

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