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

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

Properties:

• Lateral Size: 50-150 nm

• Thickness: 1-4 monolayers

• Purity in dry phase: >99%

• Solution Concentration: 26 mg/L

• Solution is stable under ambient conditions

  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 WS2is 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.1

  Depiction of WS2 Crystal Structure1

  

  WS2 in its monolayer form has recently been under particular recognition for its intriguing electrical and optical properties. Bulk WS2 is 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