Yoon Jun Hee, Selbach Florian, Langolf Ludmilla, Schlücker Sebastian
Physical Chemistry I, Department of Chemistry and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Universitätsstraße 5, 45141, Essen, Germany.
Small. 2018 Jan;14(4). doi: 10.1002/smll.201702754. Epub 2017 Nov 27.
Ideal dimers comprising gold nanoparticles with a smooth surface and high sphericity are synthesized by a substrate-based assembly strategy with efficient cetyltrimethylammonium bromide removal. An unprecedented structural and plasmonic uniformity at the single-particle level is observed since inhomogeneities resulting from variations in gap morphology are eliminated. Single ideal dimers are analyzed by polarization-resolved dark-field scattering spectroscopy. Contributions from transverse as well as quadrupolar and octupolar longitudinal plasmon coupling modes can be discriminated because of their orthogonal polarization behavior. The assignment of these higher order coupling modes is supported by computer simulations.
通过基于基底的组装策略并有效去除十六烷基三甲基溴化铵，合成了具有光滑表面和高球形度的金纳米颗粒组成的理想二聚体。由于消除了间隙形态变化导致的不均匀性，在单粒子水平上观察到了前所未有的结构和等离子体均匀性。通过偏振分辨暗场散射光谱对单个理想二聚体进行分析。由于其正交偏振行为，可以区分横向以及四极和八极纵向等离子体耦合模式的贡献。这些高阶耦合模式的归属得到了计算机模拟的支持。
