Research / 2020 / Article / Fig 1

Review Article

Optical Patterning of Two-Dimensional Materials

Figure 1

Laser thinning of 2D materials. (a) Raman mapping of G-band before (left) and after (right) laser thinning. The low intensity in the right panel within dashed lines indicates low layer thickness. (b) Raman spectra of graphite before (top) and after (right) laser thinning. Reproduced from Ref. [39] with permission from the American Chemical Society, copyright 2011. (c) Schematic of laser thinning of MoS2 via sublimation of top layers. (d) Optical images of MoS2 flake before (top) and after (bottom) laser thinning. (e) PL spectra of pristine monolayer MoS2, laser-thinned monolayer MoS2, and MoS2 with 4-6 layers. Reproduced from Ref. [45] with permission from the American Chemical Society, copyright 2012. (f) Mechanistic illustration of humidity-controlled photochemical thinning of MoTe2. (g) Flake thickness upon laser scanning as a function of relative humidity. Reproduced from Ref. [48] with permission from Wiley, copyright 2018.