多功能半导体-金属复合物图纹结构SERS活性基底构建及其在POPs可循环检测中应用研究

表面增强拉曼技术(SERS)技术可以在分子水平上提供材料的指纹信息，在有机污染物快速检测方面有广泛的应用前景。然而SERS基底结构不稳定、不易重复利用等问题仍亟待解决。本项目旨在制备以半导体TiO2为基质、包裹SiO2壳的Ag金属颗粒为修饰成分的半球壳（TiO2/Ag@SiO2）有序阵列复合结构，利用半导体材料TiO2的催化降解作用和SiO2对金属颗粒的保护作用来获得稳定的可重复使用的多功能SERS活性基底。通过调控“面-面”接触和“点-面”接触复合结构中的结构周期、材料成分比例、表面构型等因素，研究“热点”分布特征、局域电磁场效应对SERS增强能力的影响，并探索SERS增强机理；构建一种有序度高、稳定性强和可再生的多功能SERS活性基底，并将其应用于以氯代苯酚为代表的POPs分子的高效、快速、可循环检测中。

Surface-enhanced Raman Scattering(SERS) can give the fingerprint information of the material on the molecule level and can be used in the fast detection of the organic pollutants.However, some urgent problems are needed to be solved, for example,unstable and unrepeatable. In our program, the SERS-active substrate of the semi-shell TiO2/Ag@SiO2 is prepared on 2D polystyrene bead array in magnetron control system. The semi-shell TiO2 is used as the supporting layer, which is decorated by the SiO2-covered Ag nanoparticles. In this recycled SERS-active substrate TiO2 is used to realize the photocatalytic degradation of the pollutants and SiO2 is used to protect Ag from the oxidation, which lead to the stable and recycled SERS-active substrate.In the contact parts between the surface and the surface , between the point and the surface, the period, the ratio of the materials and the surface morphology are investigated, which help to reveal the hotspot distribution, the effects of the local electromagnetic field on SERS and the mechanism of the SERS enhancement. Based on all the research mentioned above, we hope to prepare the ordered,stable and recycled mutifunctional SERS-active substrate, which will be used in the efficient, fast and recycled detection of the Persistent Organic Pollutants (POPs), for example, Chloro phenol.