银基响应型粒子自组装制备光子晶体及其双效增强荧光的可控调节

Based on the fluorescent enhancement effect of colloidal photonic crystal (CPC) and metal surface, this project plans to adopt the core-shell structure design, and to couple silver nanoparticles with thermoresponsive microgel for a self-assembled CPC. Subsequently, a new type double-effect fluorescent enhancement functional material is prepared by causing the CPC surface deposition fluorescein dyes. With the aid of structural parameter optimization of the material, an influence law of synergic fluorescence enhancement of CPC and metal affected by responsive core-shell structure assembly will be studied. This project aims to reveal double-effect fluorescent enhancement mechanism of the material using spectra, fluorescent lifetime, dynamic light scattering (DLS) and other testing methods and, to investigate the fluorescence enhancement controllable by measurements of thermoresponsive properties of the material. Additionally, application of identification of heavy metal ions and thermoresponsive sensors is researched. In a word, this project is to provide not only a novel research approach and an experimental basis for preparation of new type fluorescence enhancement controllable optical devices but also to lay a solid foundation for expanding the detection fields of fluorescence enhancement theory.

基于胶体光子晶体和金属表面荧光增强效应，本项目拟采用核壳结构设计，将纳米银和温度响应型水凝胶相结合自组装成胶体光子晶体，在其表面沉积荧光素类染料，设计制备新型荧光双效增强功能材料。通过材料结构参数优化，研究响应型核壳结构组装体对光子晶体和金属协同荧光增强的影响规律。拟采用光谱、荧光寿命谱、DLS等测试方法，揭示材料荧光的双效增益机理。借助温度响应性表征，探讨材料荧光的增强可控原理，并研究其在重金属离子识别和温度响应传感器方面的应用。本项目的开展将为制备新型荧光可控光学仪器提供新的研究思路和实验依据，为拓展荧光增强理论在检测领域的应用奠定坚实的基础。

基于胶体光子晶体和金属表面增强荧光的效应，本项目提出了一种有效调控荧光增强的方法。我们采用了核壳结构设计，以纳米银作为核层结构，温度响应性水凝胶作为壳层结构制备了复合纳米粒子，将其自组装成胶体光子晶体，在其表面沉积荧光染料，制备了新型双效增强荧光的功能材料。通过结构参数优化，借助多种表征方法，研究响应型核壳结构自组装体对光子晶体和金属协同荧光增强的规律，揭示荧光增益的机理。研究表明，当光子晶体的光子带隙与荧光染料的发射波长一致时，能够提高荧光染料的荧光强度，当光子晶体的光子带隙同时覆盖荧光染料的激发和发射波长时，其荧光强度进一步提高；温度响应性壳结构能够根据外界温度变化调节壳层厚度，进而调节光子晶体的带隙位置和金属粒子与荧光染料之间的距离，达到调控荧光的目的；与金属表面增强荧光效应相比，胶体光子晶体增强荧光效果更显著。该项目研究结果为制备新型荧光可控的光学器件提供新的研究思路和实验依据，为拓展荧光增强理论在检测领域的应用奠定了一定基础。