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Product Code M2110C1-500mg
Price £220 ex. VAT

High purity tungsten disulfide powder

For applications as a high performance lubricant

Technical Data | MSDS | Structure | Literature and Reviews | Related Products | Resources and Support

One of the most distinctive features of tungsten disulfide powder (WS2, CAS number 12138-09-9) is its performance as a lubricant, even under harsh conditions (e.g. high temperature and high pressure), its coefficient of friction (CoF) of 0.03 is nearly unmatched.

Depending on the techniques used in its preparation, exfoliated 2D WS2 layers have three crystal phases: octahedral (1T) and hexagonal (2H and 3R). Such phases provide opportunities for structure engineering at an atomic level to develop new optoelectronic properties. It is known that the 2H (antiparallel) and 3R (parallel) hexagonal phases are semiconducting.

Of the two hexagonal phases, 2H is the more stable form. The octahedrally-coordinated 1T phase is not stable in a bulk form, and is associated solely with single-layer films. It is believed that the 1T phase is metallic and can be transformed from 2H WS2 by electron doping (e.g. by electron irradiation or lithium ion intercalation).

High Purity 12138-09-9

High Purity

>99% Tungsten Disulfide Purity

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Low Cost 12138-09-9

Low Cost

Low Cost Tungsten Disulfide

Applications of Tungsten Disulfide


Applications as a high performance lubricant

Technical Data

CAS Number 12138-09-9
Chemical Formula WS2
Molecular Weight 247.97 g/mol
Bandgap 1.4 - 2.01 eV [1]
Preparation Synthetic - Chemical Vapour Transport (CVT)
Structure Hexagonal (2H)
Electronic Properties 2D semiconductor
Melting Point 1250 °C (lit.)
Colour Black
Synonyms Tungsten sulphide, Tungsten sulfide, Tungsten(IV) sulfide
Classification / Family Transition metal dichalcogenides (TMDCs), 2D semiconductor materials, NIR band-gap, Nano-electronics, Nano-photonics, Transistors, Photovoltaics, Materials science

Product Details

Form Purity
Powder ≥99.995%

Pricing Table

Product Code Form Quantity Price
M2110C1 Powder 500 mg £220
M2110C1 Powder 1 g £350

MSDS Document

Tungsten disulfide powder MSDSTungsten disulfide powder

Structure of Tungsten Disulfide Powder

tungsten disulfide powder structure
The structures of Tungsten Disulfide (WS2) 1T (octahedral) and 2H (hexagonal)

Literature and Reviews

  • Controlled Synthesis and Transfer of Large-Area WS2 Sheets: From Single Layer to Few Layers, A. Elı´as et al., ACS Nano, 7 (6), 5235–5242 (2013); DOI: 10.1021/nn400971k.
  • An effective liquid-phase exfoliation approach to fabricate tungsten disulfide into ultrathin two dimensional semiconducting nanosheets, R. Jha et al., J. Mater. Sci., 52:7256–7268 (2017); DOI 10.1007/s10853-017-0962-4.
  • Enhanced Catalytic Activities of Surfactant Assisted Exfoliated WS2 Nanodots for Hydrogen Evolution, X Zhao et al., ACS Nano 2016, 10, 2159−2166; DOI: 10.1021/acsnano.5b06653.

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Resources and Support

Viscoelastic Transfer of 2D Material Using PDMS

Viscoelastic transfer using polydimethylsiloxane (PDMS) stamps is one of the methods used for the deterministic placement of 2D materials and the fabrication of van der Waals heterostructures. It relies on the viscoelasticity of PDMS, which behaves as an elastic solid on short time scales, but as a viscous fluid on long time scales.

Learn more...
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