Herrmann Janning F, Kretschmer Florian, Hoeppener Stephanie, Höppener Christiane, Schubert Ulrich S
Nanobiophotonics, Institute of Physics, University of Münster, Willhelm-Klemm-Str. 10, 48149, Münster, Germany.
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743, Jena, Germany.
Small. 2017 Oct;13(39). doi: 10.1002/smll.201701095. Epub 2017 Aug 21.
Gold-polymer hybrid nanoparticles attract wide interest as building blocks for the engineering of photonic materials and plasmonic (active) metamaterials with unique optical properties. In particular, the coupling of the localized surface plasmon resonances of individual metal nanostructures in the presence of nanometric gaps can generate highly enhanced and confined electromagnetic fields, which are frequently exploited for metal-enhanced light-matter interactions. The optical properties of plasmonic structures can be tuned over a wide range of properties by means of their geometry and the size of the inserted nanoparticles as well as by the degree of order upon assembly into 1D, 2D, or 3D structures. Here, the synthesis of silica-stabilized gold-poly(N-isopropylacrylamide) (SiO -Au-PNIPAM) core-satellite superclusters with a narrow size distribution and their incorporation into ordered self-organized 3D assemblies are reported. Significant alterations of the plasmon resonance are found for different assembled structures as well as strongly enhanced Raman signatures are observed. In a series of experiments, the origin of the highly enhanced signals can be assigned to the interlock areas of adjacent SiO -Au-PNIPAM core-satellite clusters and their application for highly sensitive nanoparticle-enhanced Raman spectroscopy is demonstrated.
金-聚合物杂化纳米粒子作为构建具有独特光学性质的光子材料和等离子体（有源）超材料的基本单元，引起了广泛关注。特别是，在存在纳米级间隙的情况下，单个金属纳米结构的局域表面等离子体共振的耦合可以产生高度增强和受限的电磁场，这经常被用于金属增强的光-物质相互作用。通过等离子体结构的几何形状、插入纳米粒子的尺寸以及组装成一维、二维或三维结构时的有序程度，可以在很宽的性质范围内调节其光学性质。在此，报道了具有窄尺寸分布的二氧化硅稳定的金-聚（N-异丙基丙烯酰胺）（SiO₂-Au-PNIPAM）核-卫星超团簇的合成及其纳入有序自组装三维组件的情况。对于不同的组装结构，发现等离子体共振有显著变化，并且观察到拉曼信号强烈增强。在一系列实验中，高度增强信号的来源可以归因于相邻的SiO₂-Au-PNIPAM核-卫星团簇的互锁区域，并证明了其在高灵敏度纳米粒子增强拉曼光谱中的应用。
