静电自组装法制备Ag@AgCl/GO复合薄膜及其SERS性能研究

Synthesis of Ag@AgCl/GO composite films by electrostatic self-assembly method and their SERS property

采用水热法制备Ag@AgCl溶胶,并采用静电自组装技术在石英基片上通过交替提拉氧化石墨烯(GO)和Ag@AgCl溶胶,制备Ag@AgCl/GO复合薄膜并用做表面增强拉曼光谱基底。采用SEM、XRD、EDS、UV-Vis以及共聚焦激光拉曼光谱测试仪对复合薄膜的结构及性能进行表征。结果表明,通过静电自组装法可以获得结构稳定,性能优异的薄膜。Ag@AgCl/GO复合薄膜除了对罗丹明6G具有优异的表面增强拉曼散射性能外(拉曼增强因子可达107数量级),由于AgCl的引入使体系具有优异的光催化降解性能,可以实现Ag@AgCl/GO表面增强拉曼光谱基底的循环利用。

In this study,Ag@ AgCl nanocomposite colloidal solution was obtained via hydrothermal method,followed by dip-coating with GO solution via electrostatic self-assembly to obtain Ag@ AgCl / GO nanocomposite films,which can be used as surface enhanced Raman scattering( SERS) substrates. The films are studied by means of SEM,XRD,EDS,UV-Vis,and laser confocal Raman spectrometer. Results showed that the obtained films are surface uniform. Ag@ AgCl /GO nanocomposite films have the optimized SERS activity on adsorbed rhodamine 6G( R6G) molecules with the maximum enhancement factor value of 1. 08 × 107. Furthermore,as the introduction of AgCl,the system has high efficient and stable photocatalytic activity under visible light,which leads to the recycling of the obtained Ag@ AgCl / GO SERS substrates.