Crystal Face Dependent Chemical Effects in Surface-Enhanced Raman Scattering at Atomically Defined Gold Facets
Crystal Face Dependent Chemical Effects in Surface-Enhanced Raman Scattering at Atomically Defined Gold Facets
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DOI：
10.1021/nl200251a
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发表时间：
2011-04-01
期刊：
影响因子：
10.8
通讯作者：
Uosaki, Kohei
中科院分区：
文献类型：
--
作者：
Ikeda, Katsuyoshi;Suzuki, Shuto;Uosaki, Kohei
在电磁和化学(CM)对表面增强拉曼散射(SEA)的贡献中，根据等离子体金属结构纳米制造的最新进展，前者正变得可控。然而，后一种效应仍然很难控制。本文利用球平型等离子体腔内的光场局域化方法，在金的单晶面上考察了各因素对SERS信号的贡献程度。基于晶面的SERS研究清楚地显示了不同表面上CM增强的差异，表明“SERS热点”的CM活性与在金属-分子结处形成的界面偶极子密切相关。
Among electromagnetic and chemical (CM) contributions to surface-enhanced Raman scattering (SEAS), the former is becoming controllable according to the recent progress in nanofabrication of plasmonic metal structures. However, it is still difficult to control the latter effect. Here, the degree of each contribution to SERS signals is examined on well-defined single crystalline facets of gold by using optical field localization within sphere-plane type plasmonic cavities. Crystal face dependent SERS studies of aminobenzenthiol adsorbates clearly show the distinction between CM enhancements on different surfaces, suggesting that the CM-activity of "SERS-hotspots" is closely related to interfacial dipoles formed at metal - molecular junctions.