Size Dependent Fluorescence Decay Dynamics of MoS2 Nanoflakes

This study reports a profound method to prepare MoS2, and the effect of ultraviolet light irradiation on its emission characteristics. The exfoliation of molybdenum di-sulfide (MoS2) in a liquid phase has been achieved successfully via probe sonication for different time intervals followed by centrifugation method. Ultraviolet-visible (UV-vis) spectra of the obtained MoS2 dispersions at different exfoliation times indicate that the concentration of MoS(2 )nanosheets as well as MoS2 quantum dots increased remarkably with increasing exfoliation time. We also note that the non-radiative recombination due to UV irradiation on MoS2 results into the decrease of emission intensity.