Tapered Optical Fiber Probe Assembled with Plasmonic Nanostructures for Surface-Enhanced Raman Scattering Application
Tapered Optical Fiber Probe Assembled with Plasmonic Nanostructures for Surface-Enhanced Raman Scattering Application
复制标题
用等离子体纳米结构组装的锥形光纤探针用于表面增强拉曼散射应用
DOI：
10.1021/acsami.5b04202
复制
发表时间：
2015-08-12
影响因子：
9.5
通讯作者：
Meng, Guowen
中科院分区：
文献类型：
--
作者：
Huang, Zhulin;Lei, Xing;Meng, Guowen
集成等离子体纳米结构的光纤拉曼器件在远程液体样品和生物样品的原位探测方面具有很好的应用前景。在该系统中，要求光纤探针同时表现出稳定的表面增强拉曼散射（Sers）信号和对目标物种的高灵敏度。在这里，我们展示了一种通用的方法来集成预合成的等离子体纳米结构与锥形光纤探针，通过浸渍蚀刻方法制备，通过硅烷偶联剂改性的二氧化硅纤维探针和纳米结构之间的反向静电吸引。利用这种方法，可以在锥形石英光纤探针上稳定地组装各种形貌的带负电和带正电的等离子体纳米结构（如Au纳米球、Ag纳米立方体、Au纳米棒、Au@ Ag核壳纳米棒）。由于等离子体单元和纤维表面之间的静电力，纳米结构不容易分散在液体样品中，使得在分析物溶液中的相对标准偏差信号低至2%。重要的是，系统的检测灵敏度可以通过调整锥角（从3.6到22）和组装在纤维上的纳米结构的形态来优化。因此，纳米结构敏化光纤拉曼探针在基于SERS的液体样品环境检测中显示出巨大的应用潜力。关于SEES
Optical fiber-Raman devices integrated with plasmonic nano-structures have promising potentials for in situ probing remote liquid samples and biological samples. In this system, the fiber probe is required to simultaneously demonstrate stable surface enhanced Raman scattering (SERS) signals and high sensitivity toward the target species. Here we demonstrate a generic approach to integrate presynthesized plasmonic nanostructures with tapered fiber probes that are prepared by a dipping etching method, through reversed electrostatic attraction between the silane couple agent modified silica fiber probe and the nanostructures. Using this approach, both negatively and positively charged plasmonic nanostructures with various morphologies (such as Au nanosphere, Ag nanocube, Au nanorod, Au@ Ag core-shell nanorod) can be stably assembled on the tapered silica fiber probes. Attributed to the electrostatic force between the plasmonic units and the fiber surface, the nanostructures do not disperse in liquid samples easily, making the relative standard deviation signals as low as 2% in analyte solution. Importantly, the detection sensitivity of the system can be optimized by adjusting the cone angle (from 3.6 to 22) and the morphology of nanostructures assembled on the fiber. Thus, the nanostructures-sensitized optical fiber-Raman probes show great potentials in the applications of SERS-based environmental detection of liquid samples. of SEES