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

在本研究中，将研究新型有机枝状大分子和金属枝状纳米复合体系的光物理性质。用超快速时间分辨发光光谱法测量有机树状大分子基本激发衰变过程的动力学。这些测量将比较均匀（核心群与树突相同）和非均匀（核心群与树突不同）树突系统的激发衰减动力学。这些体系的超快各向异性衰变也将被研究，以探索可能的能量转移机制。时间分辨测量将采用新型银（Ag）和金（Au）树状聚合物纳米复合材料。金属团簇和树枝状主体的衰变可以分离，并可以归因于相关的弛豫机制。研究了金属颗粒结构对树枝状纳米复合材料发射动力学的影响。动态测量作为一个函数的树突生成数也将进行。这些研究将探索合成树状大分子发射衰减的基本机制，并为合成树状大分子与金属纳米颗粒在纳米复合结构中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将在光学和电子器件的未来发展中发挥关键作用。有机树状大分子和金属树状大分子纳米复合材料是这种有前途的大分子结构的例子。它们有潜在的应用于光发射器、光限制器和药物释放和输送系统。

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.