金纳米粒子的二维组装与表面增强拉曼散射研究

Two Dimensional Gold Nanoparticle Assemblies as Active Substrates for Surface Enhanced Raman Scattering(SERS)

金纳米粒子的二维组装与表面增强拉曼散射研究朱涛王健符小艺张续刘忠范（北京大学化学与分子工程学院智能材料研究中心北京１００８７１）Ｔｗｏ┐ＤｉｍｅｎｓｉｏｎａｌＧｏｌｄＮａｎｏｐａｒｔｉｃｌｅＡｓｅｍｂｌｉｅｓａｓＡｃｔｉｖｅＳｕｂｓｔｒａｔｅｓｆｏ...

Abstract Self assembly of thiol derivatives on gold has been used as a well established route for interfacial engineering. In this work, an organic surface terminated by amino groups, which exhibits strong affinity to gold nanoparticles, has been successfully created by self assembling paminothiolphenol onto sputtered gold substrates through Au S bonding. Well defined gold nanoparticulate films can be readily formed by immersing the SAM modified gold substrates into colloidal gold suspensions for a given time, as revealed by the tapping mode atomic force microscopic observations. Thus prepared gold nanoparticulate films were shown to be SERS active, as evidenced by the strongly enhanced Raman scattering from the underlying SAMs. To our knowledge, it might be the first report to demonstrate that thus prepared gold nanoparticulate film can intrinsically enhance the Raman scattering from molecules just below it.