Like other TMDC family members, tungsten disulfide (WS₂) has a two-dimensional structure. It consists of a layer of hexagonally-arranged tungsten atoms positioned between two layers of hexagonally-arranged sulphur atoms.

Individual layers are held together by Van der Waals forces. This makes it possible for single to few-layer ultra-thin films to be prepared from bulk crystals using mechanical exfoliation techniques. The primitive unit cell of WS₂ consists of one tungsten atom and two sulphur atoms, arranged in a trigonal prismatic configuration.

With a photoluminescence (PL) quantum yield that is almost two orders of magnitude higher at room temperature than MoS₂, WS₂ is one of the most popular 2D semiconducting TMDCs materials, and is widely explored for applications in light-emitting devices, solar cells, and photodetectors.

General Information

CAS number	12138-09-9
Chemical formula	WS2
Molecular weight	247.97 g/mol
Bandgap	1.4 - 2.01 eV [1]
Synonyms	Tungsten sulphide, Tungsten sulfide, Tungsten (IV) sulfide
Classification / Family	Transition metal dichalcogenides (TMDCs), 2D semiconductor materials, Nano-electronics, Nano-photonics, Materials science

Product Details

Form	Single Crystal
Preparation	Synthetic - Chemical Vapour Transport (CVT)
Purity	≥ 99.999%
Structure	Hexagonal
Electronic properties	2D semiconductor
Melting point	1250 °C (lit.)
Colour	Black

Chemical Structure

Applications

In the form of single or few-layer thin films, exfoliated WS₂ nanosheets find applications ranging from light emitters, field effect transistors (FETs) and photovoltaics. Like many other TMDCs, they are actively used in condensed matter physics and photonics research.

Synthesis

Tungsten disulfide WS₂ is manufactured using chemical vapour transport (CVT) crystallisation, with crystals having a purity in excess of 99.999%.

Usage

Tungsten disulfide WS₂ can be used to prepare monolayer and few-layer WS₂ by mechanical or liquid exfoliation. 

Viscoelastic transfer of 2D material using PDMS

MSDS Documentation

Tungsten disulfide crystal MSDS sheet

Pricing

Size	Product code	Size description*	Quantity (EA)	Price
Small	M2110A10	>10 mm2	1	£396.00
Medium	M2110A25	>25 mm2	1	£637.00
Large**	M2110A00	>100 mm2	1	£1320.00

*typical representative size, areas/dimensions may vary

**item with a lead time of 2-3 weeks, please contact for more information

Literature and Reviews

1. 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.
2. Extraordinary Room-Temperature Photoluminescence in Triangular WS2 Monolayers, H. R. Gutiérrez et al., Nano Lett., 13 (8), 3447–3454 (2013); DOI: 10.1021/nl3026357.
3. Controlled Growth of High-Quality Monolayer WS2 Layers on Sapphire and Imaging Its Grain Boundary, Y. Zhang et al., ACS Nano, 7 (10), 8963–8971 (2013); DOI: 10.1021/nn403454e.
4. Photosensor Device Based on Few-Layered WS2 Films, N. Perea-López et al., Adv. Funct. Mater., 23, 5511–5517 (2013); DOI: 10.1002/adfm.201300760.
5. Direct Chemical Vapor Deposition Growth of WS2 Atomic Layers on Hexagonal Boron Nitride, M. Okada et al., ACS Nano, 8 (8), 8273–8277 (2014); DOI: 10.1021/nn503093k.

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To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.

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