Characterization of hotspots in a highly enhancing SERS substrate.
Characterization of hotspots in a highly enhancing SERS substrate.
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DOI：
10.1039/c1an15432j
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发表时间：
2011-11-07
期刊：
影响因子：
--
通讯作者：
Schultz ZD
中科院分区：
文献类型：
--
作者：
Asiala SM;Schultz ZD
将银和金气相沉积到多孔阳极氧化铝模板上，可以产生平均表面增强因子为107 - 108的Sers基底。使用暗场瑞利散射和拉曼光谱和成像的组合探索高水平的增强。表面的散射光谱表明在633 nm处的等离子体共振，并且暗场成像显示在该波长处的相对均匀的散射强度。这些测量与在衬底的拉曼图中观察到的均匀增强的拉曼强度一致。扫描电子显微镜显示，表面呈现出直径约为100 nm的异质纳米结构，这是模板中孔的尺寸。我们的测量结果表明，相邻结构之间的相互作用形成的结和裂缝可能会引起高密度的热点，这提供了非凡的Sers增强。以这种方式制备的基底的优点是热点在整个表面上的可再现的密集分布，增加了分析物将经历最大增强的可能性。
Vapor deposition of silver and gold onto a porous anodized aluminum oxide template is shown to produce a SERS substrate with an average surface enhancement factor of 107 – 108. The high level of enhancement is explored using a combination of dark-field Rayleigh scattering and Raman spectroscopy and imaging. The scattering spectrum of the surface indicates a Plasmon resonance at 633 nm and dark-field imaging shows a relatively uniform scattering intensity at this wavelength. These measurements are consistent with the uniform enhanced Raman intensity observed in Raman maps of the substrate. Scanning electron microscopy shows the surface exhibits heterogeneous nanostructures with diameters of approximately 100 nm, the size of the pores in the template. Our measurements indicate that interactions between adjacent structures forming junctions and crevices likely give rise to a high density of hotspots, which provide the extraordinary SERS enhancement. The advantage of substrates prepared in this way is the reproducibly dense distribution of hotspots across the surface, increasing the likelihood that an analyte will experience the largest enhancement.
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