Beijing National Laboratory for Molecular Sciences, Key Lab of Colloid and Interface Science, Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhong Guan Cun, Beijing, 100190 PR China.
Chemistry. 2011 Mar 14;17(12):3370-5. doi: 10.1002/chem.201003141. Epub 2011 Feb 22.
The design and fabrication of various nanostructures with predefined geometry and composition is a big challenge of nanotechnology. Here we demonstrate an Au nanoflake film replicated from a self-assembled, well-ordered, dipeptide flower-like hierarchical architecture. Such morphology can give rise to useful and remarkable surface-enhanced Raman spectroscopy (SERS) properties. We obtained these nanostructures by using a scaffold of flake-built spherical dipeptide aggregations. Gold nanoparticles were sputtered on the surface of as-assembled dipeptide by an etching system. After removing the dipeptide templates by ethanol, a metal crust was left with a morphology similar to that of the dipeptide hierarchical structure. The different steps within the process were monitored by using electron microscopy, energy-dispersive spectrum (EDS) analysis and atomic force microscopy (AFM). Cyclic voltammetry and Raman spectra were employed to prove the SERS effect of the obtained Au substrates. The enhancement factor is estimated to be about 10(4) for 4-mercaptobenzoic acid (4-MBA) molecules on the Au nanoflake surfaces.
设计和制造具有预定几何形状和组成的各种纳米结构是纳米技术的一大挑战。在这里，我们展示了一种从自组装的、有序的二肽花状分级结构复制而来的 Au 纳米片膜。这种形态可以产生有用的和显著的表面增强拉曼光谱（SERS）特性。我们通过使用片状构建的球形二肽聚集体作为支架来获得这些纳米结构。通过蚀刻系统将金纳米粒子溅射在组装好的二肽表面上。用乙醇去除二肽模板后，会留下一个金属外壳，其形态与二肽分级结构相似。该过程中的不同步骤通过电子显微镜、能谱（EDS）分析和原子力显微镜（AFM）进行监测。循环伏安法和拉曼光谱被用来证明所获得的 Au 衬底的 SERS 效应。对于 Au 纳米片表面上的 4-巯基苯甲酸（4-MBA）分子，增强因子估计约为 10（4）。
