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Tungsten Diselenide Powder

Product	Tungsten Diselenide
CAS No.	12067-46-8
Appearance	Gray
Purity	99%
APS	1-5µM (Can be customized)
Ingredient	WSe2
Product Code	NCZ-NSC676/20
Molecular Weight	341.76 g/mol
Density	9.32 g/cm³
Melting Point	>1,200ºC (>2,192°F)

Tungsten Diselenide Description

Tungsten diselenide is an inorganic compound with the formula WSe2. The compound adopts a hexagonal crystalline structure similar to molybdenum disulfide. Every tungsten atom is covalently bonded to six selenium ligands in a trigonal prismatic coordination sphere while each selenium is bonded to three tungsten atoms in a pyramidal geometry.

The tungsten–selenium bond has a length of 0.2526 nm, and the distance between selenium atoms is 0.334 nm. Layers stack together via van der Waals interactions. WSe2 is a very stable semiconductor in the group-VI transition metal dichalcogenides.

The hexagonal (P63/mmc) polymorph 2H-WSe2 is isotypic with hexagonal MoS2. The two-dimensional lattice structure has W and Se arranged periodically in layers with hexagonal symmetry. Similar to graphite, van der Waals interactions hold the layers together, however the 2D-layers in WSe2 are not atomically thin.

The large size of the W cation renders the lattice structure of WSe2 more sensitive to changes than MoS2. In addition to the typical semiconducting hexagonal structure, WSe2 exists in another polymorph, a metallic octahedral coordination phase 1T-WSe2 based on a tetragonal symmetry with one WSe2 layer per repeating unit. The 1T-WSe2 phase is less stable and transitions to the 2H-WSe2 phase.WSe2 can form a fullerene-like structure.

Related Information

Storage Conditions:

Airtight sealed, avoid light and keep dry at room temperature.

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Description

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If you are planning to order large quantities for your industrial and academic needs, please note that customization of parameters (such as size, length, purity, functionalities, etc.) is available upon request.

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