Time-Resolved Investigations of Photo-Physical Processes in Dendrimer Macromolecular and Nano-Composite Materials

本研究将探讨新型有机树枝状大分子与金属树枝状纳米复合体系的光物理性质。 探测有机树枝状聚合物中基本激发衰减过程的动力学的测量将用超快时间分辨发光光谱进行。 这些测量将比较均质（其中核心基团与树枝化基元相同）和非均质（其中核心基团与树枝化基元不同）树枝状聚合物系统中激发衰减的动力学。 这些系统的超快各向异性衰减也将被调查，以探测可能的能量转移机制。 时间分辨的测量将进行与新的银（Ag）和金（Au）树枝状聚合物纳米复合材料。 金属簇和树枝状大分子主体的衰变可以分开，并且可以归因于相关的弛豫机制。 将研究金属颗粒配置对树枝状聚合物纳米复合材料系统的发射动力学的依赖性。 动态测量作为一个功能的树枝状大分子代数也将进行。 这些研究将探索合成树枝状聚合物中发射衰减的基本机制，并对合成树枝状聚合物和金属纳米颗粒在纳米复合结构中制造时的相互作用提供新的见解。 具有重要结构特性的有机大分子在未来的光学和电子器件的发展中将发挥关键作用。 有机树枝状聚合物和金属树枝状聚合物纳米复合材料是这种有前途的大分子结构的例子。 它们作为光发射器、光限制器以及药物释放和输送系统具有潜在的应用。

In this research, the photo-physical properties of novel organic dendrimers and metal dendritic nano-composite systems will be investigated. Measurements that probe the dynamics of fundamental excitation decay processes in organic dendrimers will be carried out with ultra-fast time-resolved luminescence spectroscopy. These measurements will compare the dynamics of the excitation decay in homgenous (where core groups are the same as the dendrons) and inhomogeneous (where core groups are different from the dendrons) dendrimer systems. The ultra-fast anisotropic decay of these systems will also be investigated to probe possible energy transfer mechanisms. Time-resolved measurements will be carried out with novel silver(Ag) and gold(Au) dendrimer nano-composites. The decays of the metal clusters and the dendrimer host can be separated and the associated mechanisms of relaxation can be ascribed. The dependence of the metal particle configuration on the emission dynamics of the dendrimer nanocomposite system will be investigated. Dynamics measurements as a function of dendrimer generation number will also be carried out. These studies will probe the fundamental mechanism of emission decay in synthetic dendrimers and give new insights into the interaction of synthetic dendrimers and metal nano-particles when fabricated in a nano-composite structure. %%%Organic macromolecules with important structural properties will play a critical role in future development of optical and electronic devices. Organic dendrimers and metal dendrimer nano-composites are examples of such promising macromolecular architectures. They have potential applications as light emitters, optical limiters, and drug release and delivery systems.