Kämmer Evelyn, Dörfer Thomas, Csáki Andrea, Schumacher Wilm, Da Costa Filho Paulo Augusto, Tarcea Nicolae, Fritzsche Wolfgang, Rösch Petra, Schmitt Michael, Popp Jürgen
J Phys Chem C Nanomater Interfaces. 2012 Mar 15;116(10):6083-6091. doi: 10.1021/jp211863y. Epub 2012 Feb 14.
UV-SERS measurements offer a great potential for environmental or food (detection of food contaminats) analytics. Here, the UV-SERS enhancement potential of various kinds of metal colloids, such as Pd, Pt, Au, Ag, Au-Ag core-shell, and Ag-Au core-shell with different shapes and sizes, were studied using melamine as a test molecule. The influence of different activation (KF, KCl, KBr, K(2)SO(4)) agents onto the SERS activity of the nanomaterials was investigated, showing that the combination of a particular nanoparticle with a special activation agent is extremely crucial for the observed SERS enhancement. In particular, the size dependence of spherical nanoparticles of one particular metal on the activator has been exploited. By doing so, it could be shown that the SERS enhancement increases or decreases for increasing or decreasing size of a nanoparticle, respectively. Overall, the presented results demonstrate the necessity to adjust the nanoparticle size and the activation agent for different experiments in order to achieve the best possible UV-SERS results.
紫外表面增强拉曼光谱（UV-SERS）测量在环境或食品（食品污染物检测）分析方面具有巨大潜力。在此，以三聚氰胺为测试分子，研究了各种不同形状和尺寸的金属胶体（如钯、铂、金、银、金-银核壳结构和银-金核壳结构）的紫外表面增强拉曼光谱增强潜力。研究了不同活化剂（氟化钾、氯化钾、溴化钾、硫酸钾）对纳米材料表面增强拉曼光谱活性的影响，结果表明特定的纳米颗粒与特殊的活化剂组合对于所观察到的表面增强拉曼光谱增强极为关键。特别是，已探究了一种特定金属的球形纳米颗粒尺寸对活化剂的依赖性。通过这样做，可以表明，随着纳米颗粒尺寸的增加或减小，表面增强拉曼光谱增强分别增加或减小。总体而言，所呈现的结果表明，为了获得最佳的紫外表面增强拉曼光谱结果，对于不同的实验有必要调整纳米颗粒尺寸和活化剂。
