Raman studies of rhodamine 6G and crystal violet sub-monolayers on electrochemically roughened silver substrates: Do dye molecules adsorb preferentially on highly SERS-active sites?
Raman studies of rhodamine 6G and crystal violet sub-monolayers on electrochemically roughened silver substrates: Do dye molecules adsorb preferentially on highly SERS-active sites?
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DOI：
10.1016/j.cplett.2005.08.075
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发表时间：
2005-10-14
影响因子：
2.8
通讯作者：
Kudelski, A
中科院分区：
文献类型：
--
作者：
Kudelski, A
吸附在不同位置的分子在表面增强拉曼散射(SERS)中的增强因子明显不同。我们发现，在电化学粗糙的银衬底上，染料分子优先吸附在高度SERS活性的位置(可能是金属纳米颗粒之间的狭缝)。我们的结果表明，即使像罗丹明6G和结晶紫这样的大分子也可以定位到高度SERS活性的位置，不仅在金属纳米颗粒的重排过程中(这种机制很可能适用于金属SOT)，而且还可以扩散到已经存在的高度SERS活性的位置。这类站点的数量很少，但它们提供了非常高的表面增强效果。(C)2005 Elsevier B.V.保留所有权利。
The enhancement factors in surface-enhanced Raman scattering (SERS) are significantly different for molecules adsorbed on different sites. We show that on electrochemically roughened silver substrates dye molecules preferentially adsorb at highly SERS-active sites (probably slits between metal nanoparticles). Our results suggest that even such large molecules as rhodamine 6G and crystal violet can locate themselves into highly SERS-active sites not only during rearrangement of the metal nanoparticles (this mechanism is likely for metallic sots) but can also diffuse into already existing highly SERS-active sites. The number of such sites is small, however, they provide very high surface enhancement. (c) 2005 Elsevier B.V. All rights reserved.