负曲率表面银纳米岛状膜的组装及其表面增强荧光特性研究

Design and construction of new nano composite structure has been an important approach to regulate the surface enhanced fluorescence effect (SEF) of noble metal nano materials.Aiming at the core problem of the increase of SEF enhancement factor, this project proposes a novel composite structure with noble metal nanoisland film loaded on negative curvature surface in a spherical shell, to enhance the SEF effect of noble metal nanomaterials. Nano assembly technology, combining template method and St?ber method, will be used to load the silver nanoisland film onto the inner wall of SiO2 spherical shell, forming hollow silver-loaded SiO2 sphere,and then the controllable preparation method to regulate the size and morphology of nanocomposite structure will be studied and mastered. On this basis, the research on the structure-property relationship in optical properties and SEF characteristics of hollow silver-loaded SiO2 sphere will be carried out, to illustrate the effect mechanism of factors such as negative curvature surface, cavity, " hot spots" in island film, on the optical properties of hollow silver-loaded SiO2 sphere, and reveal the influence rule of the novel nanocomposite structure on SEF characteristics. The project may develop the new research system and the basic theory of metal nanometer material in SEF filed, and provide a new way for the design and performance control of new fluorescence detection materials.

新型纳米复合结构的设计与构建已成为贵金属纳米材料表面增强荧光（SEF）效应调控的重要技术途径。针对如何提高SEF增强因子这一核心问题，本项目提出了贵金属纳米岛状膜负载于负曲率球壳内表面的新颖复合结构，以增强贵金属纳米材料的SEF效应。采用模板法和St?ber法相结合的纳米组装技术在SiO2球壳内壁负载银纳米岛状膜制备中空载银SiO2球，研究并掌握该纳米复合结构尺寸、形貌的可控制备方法。在此基础上，重点开展中空载银SiO2球结构与其光学性质、SEF特性的关系研究，阐明负曲率表面、空腔、岛状膜"热点"等因素对中空载银SiO2球光学性质的作用机制，揭示该新型纳米复合结构对SEF特性的影响规律。通过项目研究，可丰富贵金属纳米材料在SEF领域的研究体系和基础理论，为新型荧光检测材料设计及性能调控提供新的思路。

本项目基于湿化学方法在曲面上开展纳米银颗粒的可控负载技术研究，并探讨了该特殊形貌下材料的光学性质及表面增强荧光（SEF）特性。通过项目研究，掌握了纳米银形核生长、正硅酸乙酯水解聚合、聚苯乙烯球溶胀等调控规律，制备出纳米银负载于SiO2球壳内壁的中空载银SiO2微球、核壳型Ag@SiO2纳米球组装而成的载银SiO2微球以及聚苯乙烯表面载银微球，最终成功构筑了一种有效的、基于单一微球颗粒的表面增强荧光胶囊系统，为新型荧光检测材料设计及性能调控提供了思路。