Fig. 1. Schematic diagram of monolayer MoS₂ prepared by CVD method and sulfur vapor treatment

Fig. 2. Characterization of monolayer MoS₂ crystal prepared by CVD method

Fig. 3. PL spectra of CVD-grown 1L-MoS₂, PMMA-assisted transferred 1L-MoS₂ with and without sulfur vapor treatment

Fig. 4. PLspectra of MoS₂ prepared by CVDand MoS₂ after sulfur treatment in air and undervacuum (1 Torr) conditions

Fig. 5. PL enhanced spectra of transferred MoS₂ with sulfur vapor treatment on SiO₂/Si andquartz substrates under the excitation of 532 nm CW laser

Fig. 6. PL spectra of transferred MoS₂ with and without sulfur vapor treatment on different substrates

Fig. 7. PL spectra of transferred MoS₂ with sulfur vapor treatment at 100 ℃、200 ℃、400 ℃、500 ℃