Fig. 4
From: Telluriding monolayer MoS2 and WS2 via alkali metal scooter
Temperature-dependent tellurization behavior of MoS2. a Schematic for tellurization behavior of MoS2 converted at low temperature and high temperature. Only the edge site of the MoS2 flakes is favored over converted MoTe2 at a relatively low tellurization temperature, while both the edges and surfaces of the flakes are active for tellurization at a high tellurization temperature. b Optical images of tellurized monolayer MoS2 flakes at 550 °C and 625 °C, respectively. There are two distinct regions in terms of the optical contrast (bright and dark) in the tellurized MoS2 samples; scale bars, 50 μm. c Raman spectra of tellurized MoS2 in bright and dark regions at 550 °C and 625 °C, respectively. d PL spectra of the bright regions also support that negligible Te substitution happened at 550 °C. This indicates that only the edge sites of MoS2 were active for tellurization at 550 °C
