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结合金属和二维纳米材料的优点，研究人员提出了多种二维材料/金属复合结构作为表面增强拉曼光谱(SERS)基底，然而，复合结构中的二维纳米材料通常对总增强的作用较小.本文提出了一种竖直排列的二硫化钼(MoS2)纳米片，并将其与银纳米颗粒(Ag NPs)复合，制备MoS2/Ag基底，用于SERS检测.竖直排列MoS2纳米片可有效提高对分子的吸附，增强光吸收，提升电磁和化学双机制增强.实验结果表明，MoS2/Ag基底表现出优异的SERS性能，其对R6G分子的检测极限达到了10-12 M，接近单分子检测水平，增强因子约为1.08×109.同时该基底表现出优异的信号重现性，最终实现了对水产品中抗菌剂残留的超灵敏检测.
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关键词:
- 表面增强拉曼光谱 /
- 竖直排列MoS2纳米片 /
- 银纳米颗粒 /
- 电荷转移
Surface enhanced Raman spectroscopy (SERS) can provide rich molecular structure information with ultra-sensitive, non-destructive, and rapid detection down to the single-molecule level. It has been widely applied in physics, chemistry, biomedicine, environmental science, material science and other fields. Combining the advantages of metals and 2D nanomaterials, various 2D/metal composite structures have been proposed for SERS. However, the contribution of 2D nanomaterials in Raman enhancement is often limited. In this work, vertically aligned MoS2 nanosheet composite with silver nanoparticles (Ag NPs) was proposed for SERS detection. Large-area vertically aligned MoS2 nanosheets, which were grown directly on molybdenum (Mo) foil using hydrothermal method, can effectively enhance molecular adsorption, light absorption, and provide dual electromagnetic and chemical enhancement. Furthermore, annealing treatment of the MoS2 nanosheets significantly improves the efficiency of charge transfer between Ag NPs and MoS2, thereby increasing the chemical contribution to SERS. The results demonstrate that the annealed MoS2/Ag substrate exhibits outstanding SERS performance, with a detection limit for R6G molecules as low as 10-12 M, which is four orders of magnitude lower than that of the unannealed substrate. The enhancement factor (EF) is calculated to be approximately 1.08×109, approaching the sensitivity required for single-molecule detection. Additionally, the substrate performs high signal reproducibility at low concentrations, enabling ultra-sensitive detection of pesticide residues in aquatic products.-
Keywords:
- Surface-enhanced Raman spectroscopy /
- vertically aligned molybdenum disulfide nanosheets /
- silver nanoparticles /
- charge transfer
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