Figure 5. Effect of 1.0 nm Au evaporation on the photoluminescence properties of exfoliated MoS₂.

(a) Optical image of exfoliated MoS₂ flake. Different color contrasts show the different number of layers, corresponding to 2 layers (2 L) and 3 layers (3 L) as indicated on the image. (b) AFM image of MoS₂ flake after 1.0 nm Au deposition. (c) SEM image of MoS₂ flake after 1.0 nm Au deposition. (d) PL curve of the pristine MoS₂ flake (red) and Au-MoS₂ hybrid after 1.0 nm Au deposition (black) acquired at crossed labeled 2 L in (a), showing PL quenching of peak A1 and B1. PL intensity maps of peak A1 (e, f) and B1 (g,h) before (e,g) and after (f,h) 1.0 nm Au deposition. Contours were used in (f) to facilitate the comparison.