| Ag纳米粒子聚集体的SiO2包覆及其SERS效应 |
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| 引用本文： | 李晓坤,张友林,孔祥贵.Ag纳米粒子聚集体的SiO2包覆及其SERS效应[J].发光学报,2014,35(7):853-857. |
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| 作者姓名： | 李晓坤 张友林 孔祥贵 |
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| 作者单位： | 发光学及应用国家重点实验室 中国科学院长春光学精密机械与物理研究所, 吉林 长春 130033 |
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| 基金项目： | 国家自然科学基金(11374297)资助项目 |
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| 摘 要： | 为实现表面增强拉曼散射（SERS）信号的快速检测分析,报道了一种简单的利用SiO2包覆对巯基苯甲酸（4MBA）修饰的Ag纳米粒子形成核壳结构纳米颗粒SERS标记物的方法。通过调控溶液中硝酸钠的浓度来控制4MBA-Ag的聚集程度,获得不同的“热点”效应,然后利用SiO2包覆实现对聚集体的固定。扫描电镜结果证实此种方法非常有效。该体系中SERS的信号强度依赖于4MBA-Ag的聚集程度。该研究结果有助于实现聚集体SERS标记物在生物成像、检测和传感等方面的应用。
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| 关 键 词： | 表面增强拉曼散射 银纳米粒子 热点效应 二氧化硅包覆 |
| 收稿时间： | 2014/3/27 |
Aggregation of Ag Nanoparticles Coated with Silica and Its SERS Effect |
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| LI Xiao-kun,ZHANG You-lin,KONG Xiang-gui.Aggregation of Ag Nanoparticles Coated with Silica and Its SERS Effect[J].Chinese Journal of Luminescence,2014,35(7):853-857. |
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| Authors: | LI Xiao-kun ZHANG You-lin KONG Xiang-gui |
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| Institution: | State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China |
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| Abstract: | In order to realize the unltrasensitive analysis by using the surface enhanced Raman scattering (SERS), we presented a simple and reproducible approach to encapsulate the aggregation of 4-mercaptobenzoic acid-modified Ag nanoparticles with silica. In order to obtain "hot spot", the level of aggregation could be controlled by varying the concentration of NaNO3, and then the aggregation was coated with silica, which was demonstrated with SEM. In conclusion, the SERS signal seriously depended on the level of aggregation. Due to the strong enhancement effect, this technique has the potential in biomedical field. |
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| Keywords: | surface enhanced Raman scattering Ag nanoparticles hot spot silica-coated |
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