Isolating and probing the hot spot formed between two silver nanocubes.
Isolating and probing the hot spot formed between two silver nanocubes.
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DOI：
10.1002/anie.200806139
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发表时间：
2009
影响因子：
16.6
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Camargo, Pedro H. C.;Rycenga, Matthew;Au, Leslie;Xia, Younan
本文报道了一种基于等离子体蚀刻的新策略，该策略使我们能够专门探测吸附在两个银纳米立方体之间形成的热点区域中的 SERS 活性分子。通过实验，我们验证了热点 (EFhot-spot) 的增强因子很大程度上取决于其相对于激光偏振的方向。对于边长为100 nm的两个Ag纳米立方体之间形成的热点，当二聚体的长轴相对于激光偏振方向从0（平行）度变为45和90（垂直）度时，EF热点从1.0×108变化到4.1×106和4.4×105。这些结果表明，相对于类似尺寸的单个银纳米立方体获得的 EF，热点的拉曼信号最大增强约 170 倍。虽然当二聚体的长轴平行于激光偏振时热点对观察到的SERS信号做出了主要贡献，但当二聚体相对于激光偏振处于其他方向时热点对检测到的信号没有额外贡献。
This paper reports a new strategy based on plasma etching that allows us to exclusively probe the SERS-active molecules adsorbed in the hot-spot region formed between two Ag nanocubes. Experimentally, we verified that the enhancement factor of the hot spot (EFhot-spot) was strongly dependent on its orientation relative to the laser polarization. For the hot spot formed between two Ag nanocubes of 100 nm in edge length, the EFhot-spot was found to vary from 1.0×108 to 4.1×106 and 4.4×105 as the long axis of the dimer was changed from 0 (parallel) to 45 and 90 (perpendicular) degrees relative to the direction of laser polarization. These results suggest a maximum enhancement of Raman signals by ~170 folds for the hot spot relative to the EF obtained for a single Ag nanocube of similar size. While the hot spot made a major contribution to the observed SERS signals when the dimer's long axis was parallel to the laser polarization, the hot spot did not contribute additionally to the detected signals when the dimer was in other orientations relative to the laser polarization.
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