Figure 1
From: Laser printed two-dimensional transition metal dichalcogenides
(a) Schematic illustration of direct laser printing of 2D-TMDCs, which comprises of: i. spin-coating of the precursor solution, ii. laser irradiation of the precursor and iii. development in organic solvent to remove unexposed precursor film. (b) Optical microscopy image of the laser irradiated (NH4)2MoS4 precursor film. The visible serpentine tracks correspond to laser synthesized MoS2. (c) Optical microscopy image of the pattern shown in (b) after “development” step where only the precursor film is preferentially removed leaving behind the MoS2 pattern. (d,e) Optical microscopy image of laser-synthesised MoS2 film before and after development created by overlapping raster scanning. (f) Optical microscopy image of WS2 micron-size dot array (the inset corresponds to a higher magnification image of the sample). (g,h) detached MoS2 film and tracks due to excessive developing time in DMF solvent.
