拉曼散射
基质(水族馆)
材料科学
拉曼光谱
还原剂
吸附
分子
银纳米粒子
化学工程
制作
表面增强拉曼光谱
结晶紫
纳米颗粒
纳米技术
化学
光学
物理化学
有机化学
海洋学
物理
医学
工程类
病理
地质学
替代医学
作者
Jizhou Jiang,Lei Ouyang,Lihua Zhu,Jing Zou,Heqing Tang
摘要
Through in-situ reduction of silver nitrate without using any coupling-agent, a substrate for surface-enhanced Raman scattering (SERS) was prepared by coating silver on hollow buoyant silica microspheres as a lab on a bubble (LoB). The silver coated LoBs (LoBs@Ag) floated on surface of a solution could provide a very convenient platform for the detection of target molecules in the solution. The LoBs@Ag substrate not only immobilized well-distributed Ag nanoparticles on the surface LoBs, but excluded the interference of coupling agents. This yielded high-resolution SERS spectra with excellent reproducibility. The adsorption of crystal violet (CV) on the LoBs@Ag substrate was investigated by means of SERS combined with density functional theory (DFT) calculations. The LoBs@Ag substrate exhibited a remarkable Raman enhancement effect for CV with an enhancement factor of 6.9 × 108 and wide adaptability from dye, pesticide to bio-molecules. On the basis of this substrate, a simple and sensitive SERS method was proposed for the determination of trace organic pollutants or bio-molecules.
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