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

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

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

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.

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


    SEM Thin Film

    UV-Visible Absorption Spectrum


    UV-VIS Data

    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.1

    Depiction of WS2 Crystal Structure1

    WS2 Structure

    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


    Raman Data

    Preparation Method: Solution-Based Exfoliation

    Applications:

  • Transistors
  • Flexible Displays
  • Optics
  • WS2 Research
  • Inks
  • Thin Semiconducting Films
  • We can do custom formulations, and fill orders for large volumes of the solution! Contact us for more details.

    Check out our WS2, MoS2, BN trial pack if you would like to test all three NEW products by clicking HERE!

    These materials have been used in publications, including:

    Layered memristive and memcapacitive switches for printable electronics, Bessonov et al. Nature Materials.

    Academic references:

    Electronics and optoelectronics of two-dimensional transition metal dicalcogenides, Wang et al. Nature Nanotechnology, 7 (2012), pp. 699-712

    Extraordinary room-temperature photoluminescence in WS2 monolayers, Gutierrez et al. arXiv:1208.1325 [cond-mat.mes-hall]

    Quantitative Determination of the Band Gap of WS2 with Ambipolar Ionic Liquid-Gated Transistors, Braga et al. Nano Letters, 12 (2012). pp. 5218-5223

    1Adapted from the Wikimedia Commons file Molybdenite-3D-balls.png

     
    SKU WS2-100ML
    Weight 0.10 lbs
     
    $125.00
     
    Quantity

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