Photoproperties of Fullerenes and Carbon Nanotubes

在这个由化学部实验物理化学计划资助的项目中，魏斯曼将把他的研究扩展到新发现的C60和氧的化合物，以了解它们的光和热诱导反应和结构。实验测量将包括反应动力学、激发态寿命和光谱、发光效率和光谱。此外，扩展的研究将包括C60和C70以外的富勒烯，如C84，它以几种异构体的形式存在。一种特殊的高级富勒烯是C80的细长D5d异构体。研究这种化合物的光物理性质有助于理解球形富勒烯和单壁碳纳米管性质之间的关系。最近对纳米管近红外发射的探测和解释将在更多的研究中加以利用。这些将涉及额外的纳米管跃迁的能量、分配和线形，它们的荧光量子产率的大小和物种依赖性，以及这些系统的其他重要特征。这些研究的更广泛的影响包括在太阳能转换、光限幅和光动力医学治疗方面的潜在应用，以及导致分子尺度电子学和新型高强度材料的潜在发展。

In this project, funded by the Experimental Physical Chemistry Program of the Chemistry Division, Weisman will extend his investigations to newly discovered compounds of C60 and oxygen in order to understand their light- and heat-induced reactions and structures. Experimental measurements will include reaction kinetics, excited state lifetimes and spectra, and luminescence efficiency and spectra. Further, extended studies will include fullerenes beyond C60 and C70, such as C84, which is found in several isomeric forms. A special higher fullerene is the elongated D5d isomer of C80. The photophysical properties of this compound will be studied to help understand the relation between properties of spheroidal fullerenes and single-walled carbon nanotubes. The recent detection and interpretation of near-infrared emission of nanotubes will be exploited in additional studies. These will address the energies, assignments, and line shapes of additional nanotube transitions, the magnitudes and species-dependencies of their fluorescence quantum yields, and other important characteristics of these systems. The broader impacts of these studies include potential applications to solar energy conversion, optical limiting, and photodynamic medical therapy, as well potential developments that lead to molecular-scale electronics and novel high strength materials.