有序银纳米方块阵列的SERS活性及其对有机污染物的痕量检测

项目名称： 有序银纳米方块阵列的SERS活性及其对有机污染物的痕量检测

项目编号： No.51201159

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 黄竹林

作者单位： 中国科学院合肥物质科学研究院

项目金额： 25万元

中文摘要： 三聚氰胺、多氯联苯和农药残留等有机污染物，对人类健康和环境具有严重危害。本项目拟采用液相化学法、界面自组装等技术，构筑经环糊精修饰的尺寸可控的Ag纳米方块（简称AgNC）阵列，利用阵列的高表面增强拉曼（SERS）活性、均匀性以及环糊精对污染物分子良好的选择性捕获，实现靶向富集并痕量、快速检测三聚氰胺等有机污染物的目标。项目实施中，首先利用离散偶极子近似法拟合出具有最佳电磁场增强效果的Ag纳米粒子（形状，尺寸），研究配方、还原剂、温度、腐蚀剂等参数对银纳米粒子的形态调控，探索DNA和溶剂/空气界面对Ag纳米粒子的组装行为，制备尺度可控、微米范围内排列有序的AgNC阵列。在此基础上，探究环糊精修饰的AgNC阵列对污染物分子的捕获机制及SERS响应规律，实现对污染物分子的痕量、快速检测。开展本项目，对于发展新型有机污染物的富集、痕量、快速检测方法不仅具有重要科学意义，而且具有重要的使用价值。

中文关键词： 有机污染物；表面增强拉曼散射；银纳米方块；阵列；痕量检测

英文摘要： Melamine, polychlorinated biphenyls (PCBs), and pesticide residues belong to organic pollutants that threaten human health and the ecosystem.The project aims at target capture and rapid detection of such organic pollutants at low concentrations by using cyclodextrin decorated Ag nanocube (AgNC) arrays,basing on the techniques such as liquid chemistry and interfacial self-assembly. The Ag nanocube arrays demonstrate high surface-enhanced Raman scattering (SERS) sensitivity, excellent SERS signal reproducibility, as well as good selective encapsulation ability of pollutant molecules owing to the hydrophobic cavity of cyclodextrin molecule. In the project, we firstly studied the correlation between the Ag nanoparticles shape, size and the corresponding electromagnetic enhancement. Subsequently, we investigated the influence of parameters (precursor, reductant, temperature, corrodent) on the particle shape, studied the assembly effect of AgNC either with DNA or at the solvent/air interface, to finally achieve edge length controllable and orderedly arranged AgNC arrays at micron scale. Lastly, we focused on the capture mechanism and SERS response of cyclodextrin decorated AgNC toward the organic pollutants at varied concentrations, and realize rapid detection of trace organic pollutants. The implementation of the pr

英文关键词： organic pollutants；surface-enhanced Raman scattering；Ag nanocube；array；trace detection