Tungsten Disulfide (WS₂) Pristine Flakes in Solution, 100 ML

WS₂ Pristine Flakes are nanoscale crystals dispersed in ethanol/water solution. If separated from solution, nano-WS₂ forms bright-green crystals, that look different from silver-grey crystals of bulk WS2.

This solution can be easily deposited onto a substrate or surface of your choice to form a thin film coating.

SEM image of thin-film WS₂ after the solution was used to coat SiO₂

UV-Visible Absorption Spectrum

Bulk WS₂ forms dark gray hexagonal crystals with a layered structure. They are not chemically active and can only be dissolved by a mixture of nitric and hydrofluoric acids. Each W(IV) center of WS₂ is occupying a trigonal prismatic coordination sphere, which is bound to six sulfide ligands. The sulfur centre is connected to three tungsten centres, which are pyramidal. The trigonal prisms are layered, sandwiching tungsten atoms between layers of sulfur atoms.

Depiction of WS₂ Crystal Structure

WS₂ in its monolayer form has recently been under particular recognition for its intriguing electrical and optical properties. Bulk WS₂is generally an n-type semiconductor with an indirect bandgap (-1.4 eV). On the other hand, monolayer WS₂ has a direct bandgap of -1.9 eV, and can be useful in low-power switching devices.

WS₂ Raman Spectrum

Preparation Method: Solution-Based Exfoliation

Applications:

• Transistors
• Flexible Displays
• Optics
• WS₂ Research
• Inks
• Thin Semiconducting Films