本文制备得到一种由金银合金纳米颗粒修饰的疏水性纸基表面等离激元增强拉曼光谱衬底，兼具高密度的纳米颗粒分布和高分子检测灵敏度，在痕量检测领域具有一定的研究意义。实验上将不同合金比的金银合金纳米颗粒组装到经过疏水处理的滤纸基底上，以改善衬底的表面等离激元特性。并通过调控沉积循环次数，制备得 到高密度纳米颗粒沉积的疏水纸基衬底。光谱表征结果表明，所制备衬底能够实现罗丹明6G和结晶紫探针分子的检测极限分别为10-10 M以及10-8 M；衬底对福美双分子的检测极限可达10-7 M。

This article describes a hydrophobic paper based substrate modified with gold and silver alloy nanoparticles, which has a high-density distribution of nanoparticles in the deposition range and high detection sensitivity. It has certain research significance in the field of trace detection. Firstly, different proportions of gold and silver alloy nanoparticles were assembled onto a hydrophobic treated filter paper to improve the plasmonic properties of the substrate. At the same time, high-density nanoparticles were deposited onto a hydrophobic paper substrate through cyclic stacking of the deposition process. In the field of trace detection, the detection limit of trace Rhodamine 6G and crystal violet probe molecular solutions can reach 10-10 M and 10-8 M respectively, and this substrate can be used in the field of pesticide molecular detection, and its detection limit for thiram can reach 10-7 M.