This product contains MoSe2 flakes solution in ethanol. The MoSe2 solution has been developed by ultrasonic treatment of bulk MoSe2 high quality crystals synthesized through vapor transport (CVT) technique. Since the starting material (CVT grown MoSe2 crystals) is highly crystalline, ultrasonic treatment to delaminate MoSe2 layers yields highly crystalline MoSe2 mono-, few-, and some thick layers suspended in ethanol solution. The crystallinity of MoSe2 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 MoSe2 flakes deposited onto different substrates range from ~10nm - ~10 um while thickness range from 1L to 10s of layers.