Arrays of Cone-Shaped ZnO Nanorods Decorated with Ag Nanoparticles as 3D Surface-Enhanced Raman Scattering Substrates for Rapid Detection of Trace Polychlorinated Biphenyls
Arrays of Cone-Shaped ZnO Nanorods Decorated with Ag Nanoparticles as 3D Surface-Enhanced Raman Scattering Substrates for Rapid Detection of Trace Polychlorinated Biphenyls
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银纳米粒子装饰的锥形 ZnO 纳米棒阵列作为 3D 表面增强拉曼散射基底，用于快速检测痕量多氯联苯
DOI：
10.1002/adfm.201102274
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发表时间：
2012-01-11
影响因子：
19
通讯作者：
Zhu, Chuhong
中科院分区：
文献类型：
--
作者：
Tang, Haibin;Meng, Guowen;Zhu, Chuhong
通过在大规模垂直排列的锥形氧化锌纳米棒(ZnO-NRS)的侧面和顶端同时组装小的银纳米颗粒(Ag-NPs)和大的银球，获得了一种新的、高灵敏度和均匀的三维混合表面增强拉曼散射(SERS)衬底。这种3D混合衬底对罗丹明具有很高的SERS灵敏度，对全球环境危害的持久性有机污染物多氯联苯(PCB77)的检测限低至10-11M。三维几何结构中的三种Ag-Np间隙形成了大量的SERS热点，这些热点是导致SERS灵敏度较高的主要原因。此外，由于衬底具有较大的比表面积，其支持的化学增强效应和较好的富集性也有助于实现较低的检测下限。侧面修饰银纳米颗粒的锥形氧化锌纳米颗粒阵列和顶端的大银球阵列在基于SERS的痕量多氯联苯的快速检测中具有潜在的潜力。
A new, highly sensitive and uniform three-dimensional (3D) hybrid surface-enhanced Raman scattering (SERS) substrate has been achieved via simultaneously assembling small Ag nanoparticles (Ag-NPs) and large Ag spheres onto the side surface and the top ends of large-scale vertically aligned cone-shaped ZnO nanorods (ZnO-NRs), respectively. This 3D hybrid substrate manifests high SERS sensitivity to rhodamine and a detection limit as low as 10-11 M to polychlorinated biphenyl (PCB) 77a kind of persistent organic pollutants as global environmental hazard. Three kinds of inter-Ag-NP gaps in 3D geometry create a huge number of SERS hot spots that mainly contribute to the high SERS sensitivity. Moreover, the supporting chemical enhancement effect of ZnO-NRs and the better enrichment effect ascribed to the large surface area of the substrate also help to achieve a lower detection limit. The arrays of cone-shaped ZnO-NRs decorated with Ag-NPs on their side surface and large Ag spheres on the top ends have potentials in SERS-based rapid detection of trace PCBs.