Exciton Transport in Individual Nanotubular J-Aggregates

单个纳米管 J-聚集体中的激子传输

• 批准号: 1012790
• 负责人: David Vanden Bout
• 金额: $ 37万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-15 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1012790&HistoricalAwards=false
• 关键词: Exciton; Transport; Individual; Nanotubular; Aggregates

This project targets the study of exciton energy transport in supramolecular organic systems by means of spectroscopic investigation of individual nanotubular J-aggregates used as a model light-harvesting system. Cyanine dyes such as C8S3 self-assemble in aqueous solution to form nanotubular supramolecular assemblies that are 13 nm in diameter and several microns in length. These nanotubes are similar to the highly efficient antenna systems of the natural light-harvesting complexes in Green Sulfur Bacteria and are thus attractive as a model for studying light harvesting in quasi-one-dimensional excitonic systems. These J-aggregates are studied using a combination of laser spectroscopy, near-field scanning optical microscopy (NSOM), and confocal microscopy that allows probing of individual nanotubes. Additionally, fluorescence imaging is used to directly measure the spatial extent of energy transfer in individual nanotubular aggregates to understand exciton transport in supramolecular organic systems. The project has a number broader societal impacts: an increase in the number and diversity of students pursuing chemical research, the development and dissemination of tools for nanoscale characterization of heterogeneous materials, molecular electronics, and an expanded understanding of light harvesting as it pertains to harnessing solar energy. Educational efforts leverage the Freshman Research Initiative (FRI) at UT-Austin, a program designed to bring capable underrepresented student populations that might otherwise not chose research as a career goal into the research laboratories. This award is made by the Macromolecular, Supramolecular and Nanochemistry program of the Division of Chemistry and the recipient is David Vanden Bout of the University of Texas at Austin.

该项目的目标是通过对用作模型光捕获系统的单个纳米管 J 聚集体进行光谱研究来研究超分子有机系统中的激子能量传输。 C8S3 等花青染料在水溶液中自组装，形成直径 13 nm、长度数微米的纳米管超分子组装体。这些纳米管类似于绿硫细菌中天然光收集复合物的高效天线系统，因此作为研究准一维激子系统中光收集的模型很有吸引力。这些 J 聚集体通过结合激光光谱、近场扫描光学显微镜 (NSOM) 和可探测单个纳米管的共焦显微镜进行研究。此外，荧光成像用于直接测量单个纳米管聚集体中能量转移的空间范围，以了解超分子有机系统中的激子传输。该项目具有许多更广泛的社会影响：增加从事化学研究的学生的数量和多样性，开发和传播用于异质材料纳米级表征的工具，分子电子学，以及扩大对光收集的理解，因为它涉及利用太阳能。教育工作利用了德州大学奥斯汀分校的新生研究计划（FRI），该计划旨在将有能力的、代表性不足的学生群体引入研究实验室，否则他们可能不会选择研究作为职业目标。该奖项由化学系高分子、超分子和纳米化学项目颁发，获奖者是德克萨斯大学奥斯汀分校的David Vanden Bout。