Fig. 2. (Color online) Optical microscopy images of MoS2 grains grown with (a) 2, (b) 5, (c) 10, and (d) 20 sccm flow rate of (NH4)2S precursor. (e) Statistics of grain size and the nucleation density of MoS2 grains as a function of the flow rate of (NH4)2S.
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