Huang Cai-Feng, Shen Hong-Xia, Huang Jie, Yao Jian-Lin, Gu Ren-Ao
Department of Chemistry, Chemical Engineering and Materials Sciences, Soochow University, Suzhou 215123, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2010 Dec;30(12):3240-3.
Two kinds of nanoparticles (gold nanoparticles and Au core Pt shell nanoparticles) on silicon surfaces which were silanization were electrostatically self-assembled. The density of nanoparticles was controlled by changing the time of the substrate immersed in colloids. The substrate was characterized by scanning electron microscope (SEM), and the results indicated that Au and Au@Pt particles were dispersed on the substrate with mono/submonolayers. The authors used pyridine (Py) as a probing molecule, and surface enhanced Raman spectroscopy (SERS) effect was investigated on pure Au and Au-Au@Pt mixed nanoparticle surfaces under the excitation line of 632.8 nm. The results revealed that there is a significant shift of the two characteristic peaks of Py, but the enhancement factors of Au dropped off precipitously with the introduction of the Au@Pt nanoparticles. The authors attributed this effect to the introduction of metal d-states from the metal, which would serve effectively to quench the surface plasmon excitation necessary for large (electromagnetic) enhancements in Raman spectroscopy.
对经过硅烷化处理的硅表面上的两种纳米颗粒（金纳米颗粒和金核铂壳纳米颗粒）进行了静电自组装。通过改变基底浸入胶体中的时间来控制纳米颗粒的密度。用扫描电子显微镜（SEM）对基底进行了表征，结果表明金和金@铂颗粒以单分子层/亚单分子层的形式分散在基底上。作者使用吡啶（Py）作为探测分子，在632.8 nm激发线下研究了纯金和金 - 金@铂混合纳米颗粒表面的表面增强拉曼光谱（SERS）效应。结果表明，Py的两个特征峰有明显位移，但随着金@铂纳米颗粒的引入，金的增强因子急剧下降。作者将这种效应归因于金属引入的金属d态，这将有效地淬灭拉曼光谱中实现大（电磁）增强所需的表面等离子体激元激发。
