Fig. 3: SECM feedback mapping of monolayer and bilayer MoS2.

AFM topographs and SECM maps of (a, d) three complete pieces of bilayer flakes (b, e) high density of bilayer flakes on monolayer MoS2 (c, f) give a zoomed scan of the area indicated by a dashed box in b, e. Color and height scales are identical for all images and the white bars indicate a distance of 3 μm. (Scan rate: 20 µm/s, VWE-RE (Ag): 0.6 V, Fc mediator). The inset of d gives a magnified view with adjusted contrast. g–i show SECM cross-sectional profiles along the dotted arrows in images d–f.