Cu-M（M=Au，Ag，Al）双金属合金纳米材料的制备科学及其SERS性能和增强机理研究

Alloyed metal nanomaterial has become the research focus in the metal nanomaterials due to the synergy effect between the different metallic components. Combining with the recent requirements of food safety detection and latest progress in the synthesis of metal nanomaterial and SERS applications in our group, we propose to design, controllable synthesis and SERS application of the alloyed Cu-M (M=Au, Ag, Al) bimetallic nanomaterials, and the relative mechanisms of SERS will be investigated. In this project, the mechanism of charge transfer and SERS applications are studied experimentally and theoretically by quantum chemical calculation and finite difference time domain (FDTD). The aim of this project is constructed and realized the alloyed Cu-M nanomaterials with low cost, low fluorescence interference and high SERS sensitivity. Such composite alloy system may play a greater role in the field of food safety detection, which has important theoretical value and broad application prospects.

由于不同金属间的协同效应，金属合金纳米材料已成为金属纳米材料研究热点之一。针对当前食品安全检测的需求，结合本课题组在金属纳米材料制备及表面增强拉曼散射（SERS）研究方面的最新进展，本项目拟开展Cu-M（M=Au，Ag，Al）双金属合金纳米材料的设计、可控制备、结构调控、脱合金处理及其SERS应用和增强机理研究。拟采用理论计算与实验相结合的方法，利用量子化学计算和有限时域差分法研究金属合金中的电荷转移、SERS增强等相关机理，制备出具有低成本、低荧光干扰、高SERS灵敏度的Cu基双金属合金体系。该类双金属合金纳米材料的研发具有重要理论价值和广阔的应用前景，有望在食品安全检测领域发挥更大的作用。

表面等离激元（surface plasmons, SPs）是在金属表面的自由电子与光子相互作用时形成的电磁振荡，这赋予金属一系列新奇的光学特性，例如，局域场增强、高效的光热转换效率以及对光的选择性吸收等。随着对SPs研究的日益深入和高精度纳米加工技术的不断进步，人们可以对SPs进行有效的调控以满足不同的应用。项目研究我们主要通过对金属纳米结构的形貌、组成成分的设计以及金属纳米结构与二维石墨烯材料复合来实现对贵金属SPs的有效调控。