Annealing Temperature-Dependent Surface-Enhanced Raman spectroscopy on MoS₂-Covered silver nanoparticle array

Surface-enhanced Raman spectroscopy (SERS) is an ultra-sensitive analytical tool that can effectively detect and identify molecules by their unique vibrational fingerprints. Development of SERS substrates with good stability, high sensitivity and reproducibility is still a big challenge in practical applications. Recently, 2D materials/metallic hybrid SERS substrates provide a new prospect to improve the SERS performance. Here, we obtain a monolayer MoS₂ covered silver nanoparticle (AgNP) array as a high-performance SERS substrate. Annealing temperature-dependent SERS signals on the hybrid substrate have been explored. The optimum SERS performance was obtained at 290 ℃ (the detection limit of 10^-13 M for Rhodamine 6G and the corresponding SERS enhancement factor of 8.3 × 10⁹), which is attributed to the better contact between AgNPs and MoS₂ and the uniform AgNPs with appropriate particle sizes. The prepared MoS₂/AgNPs hybrid substrates also have been utilized to detect various molecules, which demonstrates a great potential for applications in food safety and biochemical environmental detection.