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

在本研究中，我们将研究新型有机树枝状大分子和金属树枝状纳米复合体系的光物理性质。探索有机树枝状大分子基本激发衰减过程动力学的测量将使用超快时间分辨发光光谱进行。这些测量将比较均相(核心基与树枝相同)和非均相(核心基与树枝不同)树枝状大分子体系中激发衰减的动力学。这些系统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。新型的银(银)和金(金)树枝状大分子纳米复合材料将进行时间分辨测量。金属团簇的衰变和树枝状大分子主体的衰变可以分离，并可以归因于相关的松弛机制。研究了金属颗粒构型对树枝状大分子纳米复合体系发射动力学的影响。还将进行作为树枝状大分子代数函数的动力学测量。这些研究将探索合成树枝状大分子发射衰减的基本机制，并对合成树枝状大分子与金属纳米粒子在纳米复合结构中的相互作用提供新的见解。具有重要结构性质的有机大分子将在未来光学和电子器件的发展中发挥关键作用。有机树枝状大分子和金属树枝状大分子纳米复合材料就是这种有前景的大分子结构的例子。它们作为光发射体、光学限幅器和药物释放和传递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.