We fabricated two-dimensional assemblies of gold and silver nanoparticles on polycation coated substrates by a liquid–liquid interfacial precipitation method. The assembling of the metal nanoparticles on the substrate was evaluated by absorption spectroscopy and scanning electron microscopy. Raman scattering signals of Rhodamine 6G were detected on the metal nanoparticle-modified substrates. In particular, the intensities of the Raman scattering signals of the mixed gold and silver nanoparticle-modified substrates were larger than the intensities expected from a simple proportional sum of the Raman scattering signals of the individual assembly films composed of only gold or silver nanoparticles.

中文翻译：

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液-液界面沉淀法制备二维金银纳米颗粒混合组件及其表面增强拉曼散射特性

我们通过液-液界面沉淀法在聚阳离子涂层基底上制造了金和银纳米颗粒的二维组件。通过吸收光谱法和扫描电子显微镜法评价金属纳米颗粒在基材上的组装。在金属纳米粒子修饰的基材上检测了若丹明6G的拉曼散射信号。特别地，混合的金和银纳米颗粒改性的基板的拉曼散射信号的强度大于仅由仅由金或银纳米颗粒组成的单个装配膜的拉曼散射信号的简单比例和所预期的强度。