SERS‐Based Plasmon‐Driven Reaction and Molecule Detection on a Single Ag@MoS2 Microsphere: Effect of Thickness and Crystallinity of MoS2

Abstract Plasmon‐driven catalysis on a single particle has attracted great attention in recent years, while the relationship between reaction efficiency and substrate remains to be deeply studied. Here, we demonstrate the fabrication of a novel Ag@MoS 2 core‐shell single particle SERS substrate by coating MoS 2 film on Ag microspheres through the pulsed laser deposition (PLD) technique, where the thickness and crystallinity of MoS 2 can be effectively controlled by the PLD time and temperature. It is revealed that both the thickness and crystallinity of MoS 2 can greatly influence the hot electron transfer process, and thus the plasmon‐driven reaction (4‐NTP into DMAB) efficiency and Raman enhancement of dye molecules on Ag@MoS 2 substrates. Generally, high crystallinity and thin thickness of MoS 2 can lead to accelerated plasmon‐driven reaction efficiency and greatly enhanced Raman signals of target molecules. This study opens up a new avenue for broadening the research area of the plasmon‐driven catalysis and Raman enhancement on the hybrid system of two‐dimensional materials and metal nanostructures.