分级微纳结构微球的可控制备及有序表面增强拉曼散射基底构筑

项目名称： 分级微纳结构微球的可控制备及有序表面增强拉曼散射基底构筑

项目编号： No.51303001

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 宋林勇

作者单位： 安徽大学

项目金额： 25万元

中文摘要： 表面增强拉曼散射（SERS）是一种与纳米结构密切相关的光谱技术，在生物医药、材料及环境科学等领域具有广阔的应用前景。解决SERS 基底的稳定性、灵敏性和重复使用性，是其实现广泛应用的前提。本课题拟以"毛发状"聚合物微球为模板进行分级微纳结构微球的制备。通过控制模板表面毛发状聚合物链段的化学组成和聚集状态，探索在弱酸碱作用下，多层次微纳复合结构的演变规律，掌握此过程中驱动纳米粒子在模板表面成核、生长的关键要素，解决传统模板法负载纳米粒子时，微纳结构的可控性和重现性差等难题。利用毛发状微球的有序组装，结合原位反应，制备树莓状PS/SiO2/Ag/TiO2 微纳结构基底，提高SERS基底的稳定性、灵敏度和可重复使用性。项目完成有助于掌握微球表面毛发状链段在调控纳米粒子成核、生长过程中的关键问题，丰富模板法制备多微尺度复合微球的思路，为实现实用性有序SERS 基底的制备，提供理论指导和实验依据。

中文关键词： 弱酸碱作用；复合微球；分级结构；表面增强拉曼散射；毛发状微球

英文摘要： The technique of surface-enhanced Raman scattering (SERS) can provide important information of surface molecular structure and kinetic process directly. SERS-active substrates play the key role in SERS research. The conventional SERS substrates have the disadvantages of instability and poor reproducibility. So, the ordered SERS substrates obtained much more attention recently, due to their proerties of highly enhanced and reproducibility. During the past decade, increasing attention has been paid to nano/micro or hierarchically structured materials due to their unique physical and chemical properties. Although the in-situ growth on the templates surface is more an attractive approach to imitate the hierarachical structues, the relation between the micro/nano structure and the surface nature of templates is still confusion. In this work, hairy spheres are employed to construct micro/nano structrues.The hairy spheres are prepared by Atom Transfer Radical Polymerization (ATRP). By using the weak acid-base interaction (between hairy chains and the precusors), inorganic nanoparticles can nucleate and growth on the surface via in-situ sol-gel reaction. And we hope to verify the formation mechanism of berry-like polystyrene/silica in-situ sol-gel process and grasp the rules of building micro/nano structured composit

英文关键词： weak acid-base interaction；composite microsphere；hierarchical structure；SERS；hairy microsphere