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Hot-spots nanostructuration: Towards controlled Single Molecule Surface Enhanced Raman Scattering sensing

机译：热点纳米结构：朝向受控的单分子表面增强拉曼散射感测

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摘要

One of the challenges of the last decade is to control the assembly of gold or silver colloidal nanoparticles (NPs) onto a surface, in ordre to optimize the effects of surface enhancement. This reproducible and controlled nanostructuration could be useful to systematic investigation of the mechanism of surface enhanced Raman scattering (SERS)1. The fabrication of structures containing few colloidal NPs with controlled characteristics (gap, size and number of colloids...) and precisely localized onto a substrate, is particularly interesting for SERS application. The electromagnetic field concentrated within the gape, namely "hot-spots", is strongly enhanced due to near field coupling between NPs, and the resulting enhancement factors allow to detect a few molecules. Until now, the study of these hot-spots, was difficult, due to the lack of fabrication techniques.
机译：过去十年的挑战之一是将黄金或银色胶体纳米颗粒（NPS）的组装控制在表面上，以优化表面​​增强的影响。这种可重复和受控的纳米结构可用于系统地研究表面增强拉曼散射（SERS）1的机制。对于具有受控特性（间隙，尺寸和胶体的间隙，胶体的尺寸和数量）的胶体NP的结构制造并将其精确地定位在基板上，对于Sers应用特别有趣。浓缩在Gape内的电磁场，即“热点”，由于NPS之间的近场耦合而强烈地增强，并且所得到的增强因子允许检测少量分子。到目前为止，由于缺乏制造技术，对这些热点的研究很困难。

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