The surface plasmon modes of self-assembled gold nanocrystals
The surface plasmon modes of self-assembled gold nanocrystals
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DOI：
10.1038/ncomms2289
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发表时间：
2012-12-01
影响因子：
16.6
通讯作者：
Mulvaney, Paul
中科院分区：
文献类型：
--
作者：
Barrow, Steven J.;Wei, Xingzhan;Mulvaney, Paul
纳米晶体的三维自组装是材料科学中最重要的挑战之一。一个关键的里程碑是合成简单的规则结构，如柏拉图固体，由六个积木组成。这种物体被预测具有独特的光学和电子特性，如偏振无关的光散射和强烈的局部场。在这里，我们提出了一个两阶段的过程，用于制造良好定义的和高度对称的，三维金纳米结构，包括四面体，三维五聚体和三维六聚体。偏振散射光谱用于阐明存在于每个结构中的等离子体激元模式，并将其与计算模型进行比较。我们的结论是，自组装的高度对称的，偏振无关的结构与粒子间的间距为0.5 nm的顺序，现在可以制造。在间隙内产生强的局部增强场，比入射场强高1000倍。如果对称性被打破，就会产生法诺共振。
The three-dimensional (3D) self-assembly of nanocrystals constitutes one of the most important challenges in materials science. A key milestone is the synthesis of simple, regular structures, such as platonic solids, composed of nanocrystal building blocks. Such objects are predicted to have unique optical and electronic properties such as polarization-independent light-scattering and intense local fields. Here we present a two-stage process for fabricating well-defined and highly symmetric, 3D gold nanocrystal structures, including tetrahedra, 3D pentamers and 3D hexamers. Polarized scattering spectra are used to elucidate the plasmon modes present in each structure, and these are compared with computational models. We conclude that self-assembly of highly symmetric, polarization-independent structures with interparticle spacings of order 0.5 nm can now be fabricated. Drastically, enhanced local fields, 1000 times higher than the incident field strength, are produced within the interstices. Fano resonances are generated if the symmetry is broken.