Figure 6
From: Synthesis, properties and potential applications of two-dimensional transition metal dichalcogenides
Vaporization of metal oxide with chalcogen precursor. (a) Growth setup and conditions of single-layer MoS2 [70]. (b) Optical microscope images of MoS2 crystallites grown on sapphire, glass, and SiO2/Si substrates. The scale bar is 10 μm. AFM image with 3 μm scale bar. The inset plot is the height profile along the black line shown in the image, demonstrating its single-layer thickness [70]. (c) Schematic view of the related chemical reaction and experimental setup of the LPCVD system [77]. (d) SEM images of jagged edge WS2 flakes synthesized under pure Ar gas flow and mixed Ar and H2 gas flow. AFM characterization of the WS2 and optical image of bare sapphire and single-layer as-grown WS2 [77]. (e) Schematic of the controlled synthesis of single-layer MoSe2 via CVD. Typical optical images of single-layer triangles and continuous film. Small bilayer domains with a darker color can be observed in the lower left and right [78].