Photoluminescence modulation due to conversion of trions to excitons and plasmonic interaction in MoS2-metal NPs hybrid structures

Interaction of two-dimensional (2D) transition metal dichalcogenides (TMDs) with noble metal nanoparticles (NPs) is of great interest from the perspective of fundamental science, as it develops an excellent platform to study plasmon-exciton interaction and charge transfer. Here, we report a method for the large-scale synthesis of noble metals (Ag, Au and Pt) NPs decorated MoS2 flake. We find that the NPs can affect the photoluminescence (PL) emission in two ways, namely plasmon-exciton interaction and charge transfer. The types of doping-induced by the Ag, Au and Pt NPs are determined from the spectral weight of neutral and charged excitons in the PL spectra. Our results provide a quantitative estimation of the origin of PL emission from MoS2 based 2D-0D heterostructures and suggest new avenues for 2D nanoelectronics, gas sensing, catalysis, and biosensing.