Key Laboratory of Materials Physics, CAS Center for Excellence in Nanoscience, and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
Nanotechnology. 2016 Aug 12;27(32):325303. doi: 10.1088/0957-4484/27/32/325303. Epub 2016 Jul 1.
Hierarchical assembly of plasmonic nanostructures can induce high surface-enhanced Raman scattering (SERS) activity. However, it is a challenge to uniformly disperse the hierarchical nanostructures onto a planar substrate to achieve SERS signal reproducibility. This report presents a facile route to fabricate a hexagonally patterned flower-like silver particle array as the SERS substrate. First, hexagonally ordered silver hemisphere arrays with smooth surface are molded in the pores of an anodic aluminum oxide template. Ag-nanosheets are then electrodeposited onto the surface of individual silver hemispheres. The numerous nano-edges and nano-gaps between adjacent nanosheets render a large number of hot spots, leading to high SERS activity over a larger area of chip. The silver flower-like array is employed as the SERS substrate, which is able to detect 0.1 nM rhodamine 6 G and 1 μM 3,3',4,4'-tetrachlorobiphenyl (PCB-77, a persistent organic pollutant).
分层组装的等离子体纳米结构可以诱导高的表面增强拉曼散射（SERS）活性。然而，将分层纳米结构均匀地分散到平面基底上以实现 SERS 信号重现性是一个挑战。本报告提出了一种简便的方法来制备具有六边形图案的花状银粒子阵列作为 SERS 基底。首先，在阳极氧化铝模板的孔中模压出具有光滑表面的六边形有序银半球阵列。然后将 Ag 纳米片电沉积到单个银半球的表面上。相邻纳米片之间的大量纳米边缘和纳米间隙产生了大量的热点，从而在更大的芯片面积上实现了高的 SERS 活性。银花状阵列被用作 SERS 基底，能够检测到 0.1 nM 的罗丹明 6G 和 1 μM 的 3,3',4,4'-四氯联苯（PCB-77，一种持久性有机污染物）。
