Jiang Jizhou, Ou-Yang Lei, Zhu Lihua, Zou Jing, Tang Heqing
1] College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P.R. China [2] Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Chemistry and Materials Science, South Central University for Nationalities, Wuhan 430074, P.R. China.
College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, P.R. China.
Sci Rep. 2014 Feb 3;4:3942. doi: 10.1038/srep03942.
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 × 10(8) 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.
通过原位还原硝酸银而不使用任何偶联剂，在空心浮力二氧化硅微球上涂覆银制备了一种用于表面增强拉曼散射（SERS）的基底，即“气泡上的实验室”（LoB）。漂浮在溶液表面的涂银LoB（LoB@Ag）可为检测溶液中的目标分子提供非常便捷的平台。LoB@Ag基底不仅能将分布均匀的银纳米颗粒固定在LoB表面，还排除了偶联剂的干扰。这产生了具有出色重现性的高分辨率SERS光谱。通过SERS结合密度泛函理论（DFT）计算研究了结晶紫（CV）在LoB@Ag基底上的吸附。LoB@Ag基底对CV表现出显著的拉曼增强效应，增强因子为6.9×10⁸，并且对染料、农药到生物分子具有广泛的适应性。基于此基底，提出了一种简单灵敏的SERS方法用于测定痕量有机污染物或生物分子。
