Effect of silver nanoplates on Raman spectra of p-aminothiophenol assembled on smooth macroscopic gold and silver surface
Effect of silver nanoplates on Raman spectra of p-aminothiophenol assembled on smooth macroscopic gold and silver surface
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DOI：
10.1021/jp066444k
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
Yuling Wang;Xiangqin Zou;Wen Ren;Weidong Wang;E. Wang
中科院分区：
文献类型：
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作者：
Yuling Wang;Xiangqin Zou;Wen Ren;Weidong Wang;E. Wang
最近，金属-分子-金属结由于其在分子电子学中的潜在应用而受到积极研究，探测结中分子的结构对于理解电子转移特性至关重要。本文首次在光滑的宏观金、银表面上制备了对氨基苯硫酚（p-ATP）自组装单分子膜（SAM），并在SAM表面组装了边长约100 nm、厚度约12 nm的胶体银纳米片，形成了银纳米片-分子-金（银）结。分别在514.5、794.4和1064 nm激发下用表面增强拉曼散射（Sers）研究了所得的银纳米片-分子-金（银）结构。最初，在光滑的宏观金和银基底上分别存在非常弱的p-ATP的拉曼信号，但是拉曼光谱由于银纳米片的存在而显著增强，这是由于强的电磁耦合。
Recently, metal−molecule−metal junctions have been actively researched due to their potential applications in molecular electronics, and probing the structure of the molecules in the junctions is crucial for understanding electron-transfer properties. In this paper, self-assembled monolayers (SAMs) of p-aminothiophenol (p-ATP) are formed on a smooth macroscopic gold and silver surface, and colloidal silver nanoplates (∼100 nm edge length and 12 nm thickness) are assembled onto the SAM surface to form the silver nanoplates−molecule−gold (silver) junctions for the first time. The resulting silver nanoplates−molecules−gold (silver) structures are studied with surface enhanced Raman scattering (SERS) at 514.5, 794.4, and 1064 nm excitations, respectively. Initially, there is very weak Raman signal of p-ATP on the smooth macroscopic gold and silver substrates, respectively, but Raman spectra are considerably enhanced by the presence of the silver nanoplates, which is due to the strong electromagnetic coupling ...