Figure 2 Changes in the morphology of MoS 2  crystals
based on
growth temperature. (a–f) Optical microscope images of MoS 2  grown on the SiO 2  substrate with temperature changing
from 700 to 900 °C with 25 mg of NaCl and a MoO 3 /S
ratio of 1:20. (g) Edge length of a large-area MoS 2  flake
grown at 800 °C. (h) AFM image and the line profile of monolayer
MoS 2  crystal grown at a temperature of 780 °C.