This product contains WS2 flakes solution in ethanol. The WS2 solution has been developed by ultrasonic treatment of bulk WS2 high quality crystals synthesized through vapor transport (CVT) technique. Since the starting material (CVT grown WS2 crystals) is highly crystalline, ultrasonic treatment to delaminate WS2 layers yields highly crystalline WS2 mono-, few-, and some thick layers suspended in ethanol solution. The solution predominantly contains monolayer flakes, however other thickness might be observed as well. The crystallinity of WS2 nanomaterials has been confirmed through electron energy dispersive spectroscopy (EDAX), Raman spectroscopy (FWHM<5cm-1), and scanning electron microscopy (SEM) measurements. Depending on the thickness of the layers, flakes deposited on different substrates produce light emission (photoluminescence). Lateral sizes of WS2 flakes deposited onto different substrates range from ~10nm - ~10 um while thickness range from 1L to 10s of layers. 

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