探索具有高效贵金属纳米间隙的表面增强拉曼散射基底是解决当前紧迫环境污染物检测问题的关键。针对国内外贵金属纳米间隙结构的发展现状，结合本课题组在二维材料-贵金属阵列复合SERS基底的研究进展，本项目提出开展窄带隙二维过度金属硫族化合物间隔层与贵金属阵列复合结构的设计、可控制备、结构调控及其在 SERS中的应用和增强机理研究。采用实验与理论计算相结合的方法，利用有限时域差分法和量子化学计算研究MTe2与贵金属阵列在光激发下的局域电磁场增强及电荷转移等相关机理，最终实现具有增强能力强、信号稳定、重复性好、杂峰干扰少、共振波长可调、高性能的SERS基底材料的制备和在实际检测中的应用。该二维材料-贵金属阵列复合SERS基底的研发具有重要理论价值和广阔的应用前景，有望在环境污染物检测领域发挥更大的作用。

The strategy to explore the efficient nanogap system of noble metal as SERS substructure is the key role in solving the present detection problem of the urgent environment pollutant. Combining with the recent developing status of nanogaps in noble metal and latest progress in the synthesis of the two-dimensional materials and composite SERS substructures in our group, we propose to design, controllable synthesis, SERS application, and enhancement mechanism of the 2D MTe2 (M=Mo,W) as the nanospacer of film–array coupling system, and the relative mechanisms of SERS will be investigated. In this project, the mechanisms of charge transfer and local field enhancement in SERS applications are studied experimentally and theoretically by the quantum chemical calculation and the finite difference time domain. The aim of this project is constructed and realized the 2D MTe2 as the nanospacer of film–array coupling system as SERS substructure with the reproducible SERS signals, less disturbance, tunable localized surface plasmon resonance wavelength, and high SERS sensitivity. Such composite system may play a greater role in the field of environment pollutant detection, which has important theoretical value and broad application prospects.