Figure 1. Scanning electron microscopy (SEM) secondary image and CL spectroscopy and monochromatic maps of a typical single exfoliated multilayer MoS₂ flake.

(a) Secondary electron SEM image of the MoS₂ micrometric flake. (b) CL spectrum of the MoS₂ flake (solid line) compared with the spectrum of molybdenite as a reference (dashed line). (c,d) Monochromatic maps at 0.75 and 1.07 eV, respectively.