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Tungsten Diselenide (WSe2) Powder and Crystal


Product Code M2111C1
Price $220.00 ex. VAT

Low price, high purity 2D tungsten Diselenide (WSe2) powder and crystals

Suitable for the creation of single or few-layer sheets via mechanical or liquid exfoliation


Bulk tungsten diselenide (WSe2) has a high absorption coefficient, high photostability, and a band-gap of 1.2 eV. It is an indirect band-gap semiconducting material that can be both n- and p-doped. The ambipolar nature of WSe2 makes it possible to create electronic devices that include p−n junctions or complementary logic circuits.

Tungsten diselenide single layers are composed of a layer of tungsten atoms positioned between two layers of selenium atoms, with each tungsten atom coordinating through strong covalent-ionic bonds to six selenium atoms in a trigonal prismatic geometry.  As occurs in graphene, black phosphorus and other TMDC materials, multilayer structures are stabilised by weak Van de Waal forces. These forces are strong enough to hold layers together, but weak enough to allow mechanical exfoliation.

Like WS2 and other TMDCs, 2-dimensional layered tungsten diselenide (WSe2) has a 2H (semiconducting) structure. This structure is the more stable form of the two hexagonal phases that exist in the naturally-occurring bulk-material forms. A 1T octahedral phase also exists - this is metallic in nature and is only associated with single layer films. Monolayer, few-layer nanosheet structures, and nanoparticles can be prepared by mechanical or chemical exfoliation. It has been demonstrated that the phase change from 2H to 1T can happen via chemical treatments, such as lithium-assisted intercalation of bulk crystals or powder by liquid exfoliation.

We supply low price tungsten diselenide in several different forms for a range of applications.

Tungsten diselenide powder

Tungsten Diselenide Powder

Can be used for preparation of tungsten diselenide nanoplates and ultrathin films

Available in quantities of 500 mg or 1 g

≥99.995% purity

From £200.00

Tungsten diselenide crystals by size

Tungsten Diselenide Crystals by Size

Can be used to produce single or few-layer tungsten diselenide sheets via mechanical or liquid exfoliation

Small (≥10 mm2) or medium (≥25 mm2) crystals available*

≥99.999% purity

From £480.00

*Typical representative size, areas/dimensions may vary

Bulk single tungsten diselenide crystal is most commonly used as sources from which single or few-layer sheets can be obtained via either mechanical or liquid exfoliation. Single tungsten diselenide crystal or films produced from such crystals are suitable for study using atomic force microscopy or transmission electron microscopy

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Few-layer WSe2 nanosheets and nanoparticles can also obtained from tungsten diselenide powder by liquid-exfoliation using  mixture of 30% of isopropanol in water. Ti and V intercalated WSe2 create delocalized antiferromagnetism, while Cr, Mn, Fe, and Co exhibit localized ferromagnetism in WSe2. Iron-series transition-metal atoms intercalated WSe2 may have potential applications in spin electronics and quantum-information devices.

Key Product Data

Structure of Tungsten Diselenide 

Tungsten diselenide single layers are composed of a layer of tungsten atoms positioned between two layers of selenium atoms, with each tungsten atom coordinating through strong covalent-ionic bonds to six selenium atoms in a trigonal prismatic geometry.  As occurs in graphene, black phosphorus and other TMDC materials, multilayer structures are stabilised by weak Van de Waal forces. These forces are strong enough to hold layers together, but weak enough to allow mechanical exfoliation.

Like WS2 and other TMDCs, 2-dimensional layered tungsten diselenide (WSe2) has a 2H (semiconducting) structure. This structure is the more stable form of the two hexagonal phases that exist in the naturally-occurring bulk-material forms. A 1T octahedral phase also exists - this is metallic in nature and is only associated with single layer films. Monolayer, few-layer nanosheet structures, and nanoparticles can be prepared by mechanical or chemical exfoliation.

The 2H-WSe2 phase has a hexagonal symmetry, with a trigonal prismatic metal coordination, where layers of selenium atoms are stacked directly above one another. The 1T-WSe2 phase has a tetragonal symmetry, with an octahedral metal coordination, as the layers are offset from each other. It has been demonstrated that the phase change from 2H to 1T can happen via chemical treatments, such as lithium-assisted intercalation of bulk crystals or powder by liquid exfoliation.

tungsten diselenide - WSe2 crystal structure
The crystal structure of single-layer tungsten diselenide (WSe2)

Properties of Tungsten Diselenide

After exfoliation of tungsten Diselenide crystal or powder, tungsten Diselenide typically has the following properties:

  • ‎2H Hexagonal (space group: P6_3/mmc)
  • High absorption coefficient and high photostability
  • 2H-WSe2 is semiconducting and 1T-WSe2 is metallic in nature
  • Phase change from 2H to 1T can happen via chemical treatments

Applications of Tungsten Diselenide

Tungsten diselenide single crystal can be used to prepare monolayer and few-layer WSe2 by mechanical or liquid exfoliation, and tungsten Diselenide powder is suitable for liquid chemical exfoliation to prepare WSe2 nanosheets and nanoparticles down to few-layer films.

2H-WSe2 nanosheets and particles play an important role in device applications such as transistors, photodetectors, light emitting diodes, photovoltaic solar cells, and in biomedical and photothermal therapies.

Monolayer or few-layer WSfilms that are mechanically exfoliated from bulk WScrystals have been explored for applications in FETs, electrochemical cells, thermoelectrics, sensors, and light-emitting diodes. The energy gap of WSe2 (1.2 - 1.4 eV) makes it perfect for applications in photovoltaics and solar cells.

The 1T-WSe2 phase is of particular interest for hydrogen evolution reactions (HER). Aside from that, exfoliated 2H-WSe2 nanosheets and particles play an important role in device applications such as transistors, photodetectors, light emitting diodes, photovoltaic solar cells, and in biomedical and photothermal therapies.

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Literature and Reviews

  • Layer-dependent electronic structure of an atomically heavy two-dimensional dichalcogenide, P-C. Yeh et al., Phys. Rev. B 91, 041407 (2015); DOI: 10.1103/PhysRevB.91.041407.
  • Strain-Induced Indirect to Direct Bandgap Transition in Multilayer WSe2,
    S. B. Desai et al., Nano Lett., 14 (8), 4592–4597 (2014); DOI: 10.1021/nl501638a.
  • Large-Area Synthesis of Highly Crystalline WSe2 Monolayers and Device Applications, J. Huang et al., ACS Nano, 8 (1), 923–930 (2014); DOI: 10.1021/nn405719x.
  • Preparation and Applications of Mechanically Exfoliated Single-Layer and Multilayer MoS2 and WSe2 Nanosheets, H. Li et al., Acc. Chem. Res., 47, 1067−1075 (2014); DIO: 10.1021/ar4002312.
  • Large-area synthesis of monolayer WSe2 on a SiO2/Si substrate and its device applications, J. Huang et al., Nanoscale, 7, 4193 (2015); DOI: 10.1039/c4nr07045c.
  • Dynamic tungsten diselenide nanomaterials: supramolecular assembly-induced structural transition over exfoliated two-dimensional nanosheets, A. Muhabie et al., Chem. Sci., 9, 5452 (2018); DOI: 10.1039/c8sc01778f.
  • 2H - 1T phase transition and hydrogen evolution activity of MoS2, MoSe2, WS2 and WSe2 strongly depends on the MX2 composition, A. Ambrosi et al., Chem. Commun., 51, 8450 (2015); DOI: 10.1039/c5cc00803d.
  • Self-assembled 2D WSe2 thin films for photoelectrochemical hydrogen production, X. Yu et al., Nat Commun 6, 7596 (2015); DOI: 10.1038/ncomms8596.
  • Atomic-layer triangular WSe2 sheets: synthesis and layer-dependent photoluminescence property, K. Xu et al, Nanotechnology 24, 465705 (2013); doi:10.1088/0957-4484/24/46/465705.
  • Solution-Phase Synthesis of Highly Conductive Tungsten Diselenide Nanosheets, P. D. Antunez et al., Chem. Mater., 25, 2385−2387 (2013); DIO: 10.1021/cm400790z.

Technical Data

CAS Number ‎12067-46-8
Chemical Formula WSe2
Molecular Weight 341.76 g/mol
Bandgap 1.4 - 2.01 eV
Preparation Synthetic - Chemical Vapour Transport (CVT)
Structure Hexagonal (2H)
Electronic Properties 2D semiconductor
Melting Point ‎‎>1200 °C
Colour Metallic black
Synonyms Tungsten selenide, Tungsten(IV) Selenide 
Classification / Family Transition metal dichalcogenides (TMDCs), 2D Semiconductor materials, Charge Density Wave (CDW), type II Weyl semimetal, Nano-electronics, Nano-photonics, Photovoltaic, Materials science

Product Details

Form Purity
Powder ≥99.995%
Crystal ≥99.999%

MSDS Documents

Tungsten Diselenide powder MSDSTungsten diselenide powder

Tungsten Diselenide crystal MSDSTungsten diselenide crystal

Pricing Table

Product Code Form Size/Weight* Price
M2111C1 Powder 500 mg £200.00
M2111C1 Powder 1 g £320.00
M2111A10 Crystal Small (≥10 mm2) £480.00 ea.
M2111A25 Crystal Medium (≥25 mm2) £760.00 ea.
M2111A00 Crystal Large** (≥100 mm2) £2100.00 ea.

*typical representative size, areas/dimensions may vary

**item with a lead time of 4 - 6 weeks, please contact for more information

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To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.

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