A novel surface-enhanced Raman spectroscopy substrate based on a large area of MoS2 and Ag nanoparticles hybrid system

Abstract Few layers MoS 2 were directly synthesized on Ag nanoparticles (AgNPs) by thermal decomposion method to fabricate a MoS 2 /AgNPs hybrid system for surface-enhanced Raman scattering (SERS). The MoS 2 /AgNPs hybrid system shows high performance in terms of sensitivity, signal-to-noise ratio, reproducibility and stability. The minimum detected concentration from MoS 2 /AgNPs hybrid system for R6 G can reach 10 −9  M, which is one order of magnitude lower than that from AgNPs system. The hybrid system shows the reasonable linear response between the Raman intensity and concentration that R 2 is reached to 0.988. The maximum deviations of SERS intensities from 20 positions of the SERS substrate are less than 13%. Besides, the hybrid system has a good stability, the Raman intensity only drop by 20% in a month. This work can provide a basis for the fabrication of novel SERS substrates.