Surface-enhanced Raman spectroscopy and nanogeometry: The plasmonic origin of SERS
Surface-enhanced Raman spectroscopy and nanogeometry: The plasmonic origin of SERS
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DOI：
10.1021/jp077422g
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发表时间：
2007-12-13
影响因子：
3.7
通讯作者：
Moskovits, Martin
中科院分区：
文献类型：
--
作者：
Lee, Seung Joon;Guan, Zhiqiang;Moskovits, Martin
使用一系列由多孔氧化铝中制造的周期性银纳米线组成的高度规则的纳米结构，我们验证了最强烈的 SERS 信号（例如负责单分子 SERS 的信号）的压倒性等离子体起源，证明了其对系统纳米几何结构的敏感依赖性。通过将线间间隙距离从 35 nm 更改为 10 nm，用 785 nm 激光激发的 SERS 强度增加了 200 倍以上。这些观察结果与使用自由空间格林张量方法进行的电磁场计算在数量上一致。
Using a series of highly regular nanostructures consisting of periodic Ag nanowires fabricated in porous aluminum oxide, we validate the overwhelmingly plasmonic origin of the most intense SERS signals such as those responsible for single-molecule SERS, demonstrating its sensitive dependence on the system's nanogeometry. By varying the interwire gap distance from 35 to 10 nm, the SERS intensity excited with 785 nm laser light, increased over 200-fold. These observations were shown to agree quantitatively with electromagnetic field calculations carried out using the free space green's tensor method.