Au@SiO_2纳米核壳结构的制备及光学性质研究  

Preparation of Au@SiO_2 Core-Shell Nanoparticles: Controlling the Optical Properties

作　　者：谭恩忠[1,2] 殷鹏刚[2] 黄伟峰[2] 于舸[1] 于春娜[1] 

机构地区：[1]北京石油化工学院数理系,北京102617 [2]北京航空航天大学化学与环境学院,仿生智能界面科学与技术教育部重点实验室,北京100191

出　　处：《光谱学与光谱分析》2012年第12期3267-3270,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(51002007)资助

摘　　要：采用一种新方法制备了Au@SiO2核壳结构的纳米颗粒,利用透射电镜和紫外-可见吸收光谱对产物的形貌和稳定性进行了表征。以对巯基苯甲酸(PMBA)作为探针分子,分析了Au@SiO2颗粒的SERS特性,结果表明Au@SiO2/PMBA具有稳定的SERS信号;通过控制SiO2前驱体(TEOS)的使用量,成功实现了对SiO2层厚度的调节;研究了Au@SiO2颗粒在碱性溶液中的稳定性,结果显示在pH 10的溶液中,SiO2壳层在24h内被明显腐蚀,96h后完全消失。此工作将为Au@SiO2的制备、存放和应用提供有益的参考。The authros developed a new approach to preparing the Au@SiO2 core-shell nanostructure. The morphology and sta- bility of the composite were characterized by the UV-Vis absorption spectroscopy and transmission electron microscopy （TEM） methods. The stable SERS spectra were obtained from the PMBA-functionalized Au@SiO2 composite. In addition, the authros succeeded in adjusting the thickness of SiO2 layer by controlling the precursor consumption. The stability of Au@SiO2 in basic solution was studied and the results showed that the SiO2 shell was facile to be etched. The present work may provide a reference and gist for research on the preparation, storage and application of Au@SiO2.

关 键 词：Au@SiO2 核壳结构 表面增强拉曼光谱 腐蚀法 

分 类 号：O648[理学—物理化学] O657[理学—化学]