复合纳米材料Cu_2O@Au对水体中罗丹明B的检测应用研究  

Stable Cu_2O@Au for Accurate and Rapid Surface Enhancement Raman Scattering Analysis of Rhodamine B

作　　者：王晓蒙[1] 张振[1] 刘静[1] 张书圣[1] 

机构地区：[1]临沂大学,临沂276005

出　　处：《分析化学》2017年第12期2026-2031,共6页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.21645001;21705070;21405071;21775061)资助~~

摘　　要：制备了多面体Cu_2O纳米粒子,利用Cu_2O的还原性,在其表面原位生成了不同密度的Au纳米粒子,制备了Au、Cu共同增强拉曼信号的复合纳米粒子Cu_2O@Au。利用透射电镜(TEM)、扫描电镜(SEM)、X射线衍射(XRD)等对制备的Cu_2O和Cu_2O@Au的形貌、粒径、表面性能等进行了表征。研究了Cu_2O表面金纳米粒子的分布密度对水样中目标检测物罗丹明B的拉曼增强效果。结果表明,氯金酸浓度在1 mmol/L时制备的Cu_2O@Au表面均匀覆盖一层金纳米粒子,其表面增强拉曼效果最为显著,对水样中罗丹明B检测范围为1×10^(-2)~5×10^(-6)mol/L。研究了此探针在PBS(1×)和酸性水溶液(0.01 mol/L HCl)中的稳定性,并将其用于沂河水样中靶标的检测实验,结果表明,其稳定性较好。A simple and efficient method for fabricating a novel surface-enhanced Raman scattering( SERS)substrate with good reproducibility and high SERS activity was reported. Cu_2O was prepared by mixing Cu Cl_2·2 H_2 O with ascorbic acid,which was then used as the templates for depositing of gold nanoparticles( Au NPs) on their surfaces,forming Cu_2O @ Au with heterostructures. Transmission electron microscopy,scanning electron microscopy and X-ray diffraction observation revealed that Cu_2O had polyhedral structure and smooth surface,and Au NPs were closely deposited on the surface of Cu_2O. It was used as SERS substrate for detection of Rhodamine B with linear detection range of 1 × 10^(-2)-5 × 10!6 mol/L,and detection limit of 3 ×10^(-7) mol/L. Cu_2O@ Au showed good chemical stability,remained stable in acid,PBS and river samples,and could be used in the SERS detection of target in water sample.

关 键 词：Cu2O纳米粒子 AU纳米粒子 表面增强拉曼散射 罗丹明B 

分 类 号：O657.37[理学—分析化学] X832[理学—化学]