Camargo Pedro H C, Au Leslie, Rycenga Matthew, Li Weiyang, Xia Younan
Department of Biomedical Engineering, Washington University, St. Louis, MO 63130, USA.
Chem Phys Lett. 2010 Jan;484(4-6):304-308. doi: 10.1016/j.cplett.2009.12.002.
We describe a systematic investigation on the SERS enhancement factors of individual dimers (EF(dimer)) constructed from two Ag nanocubes that display a face-to-face, edge-to-face, or edge-to-edge structure. The highest field-enhancements were obtained for the dimers displaying a face-to-face and edge-to-face configuration. In these two systems, EF(dimer) was insensitive the dimer geometry and corresponded to 2.0×10(7) and 1.5×10(7), respectively. However, EF(dimer) was decreased to 5.6×10(6) for the edge-to-edge structure. These variations in the detected field-enhancements could be explained based on the relative orientation of the nanocubes and the number of probe molecules enclosed in the hot-spot region for each dimer configuration.
我们描述了一项关于由两个银纳米立方体构建的单个二聚体(EF(dimer))的表面增强拉曼散射(SERS)增强因子的系统研究,这些二聚体呈现面对面、边对面或边对边结构。对于呈现面对面和边对面构型的二聚体,获得了最高的场增强。在这两个系统中,EF(dimer)对二聚体几何形状不敏感,分别对应于2.0×10(7)和1.5×10(7)。然而,对于边对边结构,EF(dimer)降至5.6×10(6)。检测到的场增强的这些变化可以基于纳米立方体的相对取向以及每种二聚体构型在热点区域内包封的探针分子数量来解释。