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

摘要

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@MoS2 core-shell single particle SERS substrate by coating MoS2 film on Ag microspheres through the pulsed laser deposition (PLD) technique, where the thickness and crystallinity of MoS2 can be effectively controlled by the PLD time and temperature. It is revealed that both the thickness and crystallinity of MoS2 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@MoS2 substrates. Generally, high crystallinity and thin thickness of MoS2 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.