Chen Bensong, Meng Guowen, Zhou Fei, Huang Qing, Zhu Chuhong, Hu Xiaoye, Kong Mingguang
Key Laboratory of Materials Physics, and Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
Nanotechnology. 2014 Apr 11;25(14):145605. doi: 10.1088/0957-4484/25/14/145605. Epub 2014 Mar 14.
Large-scale hexagonally close-packed arrays of Au-nanobowls (Au-NBs) with tens of Ag-nanoparticles (Ag-NPs) dispersed in each bowl (denoted as Ag-NPs@Au-NB arrays) are achieved and utilized as effective surface-enhanced Raman scattering (SERS) substrates. The field enhancement benefiting from the special particle-in-cavity geometrical structure as well as the high density of SERS hot spots located in the sub-10 nm gaps between adjacent Ag-NPs and at the particle-cavity junctions all together contribute to the high SERS activity of the Ag-NPs@Au-NB arrays; meanwhile the ordered morphological features of the Ag-NPs@Au-NB arrays guarantee uniformity and reproducibility of the SERS signals. By modifying the Ag-NPs@Au-NB arrays with mono-6-thio-β-cyclodextrin, the SERS detection sensitivity to 3,3('),4,4(')-tetrachlorobiphenyl (PCB-77, one congener of polychlorinated biphenyls (PCBs, kinds of persistent organic pollutants which represent a global environmental hazard)) can be further improved and a low concentration down to 5 × 10(-7) M can still be examined, showing promising potential for application in rapid detection of trace-level PCBs in the environment.
实现了由金纳米碗（Au-NB）构成的大规模六角密排阵列，每个碗中分散有数十个银纳米颗粒（Ag-NP）（记为Ag-NPs@Au-NB阵列），并将其用作有效的表面增强拉曼散射（SERS）基底。得益于特殊的腔内颗粒几何结构以及位于相邻Ag-NP之间亚10纳米间隙和颗粒-腔交界处的高密度SERS热点，场增强共同促成了Ag-NPs@Au-NB阵列的高SERS活性；同时，Ag-NPs@Au-NB阵列有序的形态特征保证了SERS信号的均匀性和可重复性。通过用单-6-硫代-β-环糊精修饰Ag-NPs@Au-NB阵列，可以进一步提高对3,3′,4,4′-四氯联苯（PCB-77，多氯联苯（PCBs）的一种同系物，多氯联苯是一类全球性环境危害的持久性有机污染物）的SERS检测灵敏度，甚至可以检测低至5×10⁻⁷ M的浓度，显示出在环境中痕量多氯联苯快速检测应用中的广阔前景。
