Figure 5 Changes in the morphology of MoS 2  crystals
based on
the amount of NaCl. (a–f) Optical microscopic images of MoS 2  grown on a SiO 2  substrate with the NaCl amount
changing from 5 to 100 mg with a MoO 3 /S ratio of 1:20 at
a growth temperature of 780 °C. (g) The AFM topography shows
the thickness of these bright spots around 14 nm.