Fig. 3. (a): SEM image where the arrows indicate the sites of the EDX spectra. (b) EDX spectra of ML MoS2 (red line), gold NPs on ML MoS2 (green line) and on BL MoS2 (cyan line) and the reference of gold NPs on the SiO2 substrate (black line), respectively. The asterisk indicates a peak due to the instrumental system.
