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.

该项目针对超分子有机系统中激子能量传输的研究，该项目通过对单个纳米管的单个纳米管j聚集体进行光谱研究，用作模型的轻度收获系统。在水溶液中的Cyanine染料，例如C8S3自组装，形成直径为13 nm的纳米管超分子组件，长度为几微米。这些纳米管类似于绿色硫细菌中自然光捕获复合物的高效天线系统，因此作为研究准二维激发型系统中的光收集的模型有吸引力。使用激光光谱，近场扫描光学显微镜（NSOM）和共聚焦显微镜的组合研究了这些J种群，从而探测单个纳米管。此外，荧光成像用于直接测量单个纳米管骨料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。该项目具有更广泛的社会影响：追求化学研究的学生的数量和多样性，用于纳米级特征的工具的开发和传播异质材料的纳米级工具，分子电子设备以及对光线收获的不断扩展的了解，因为它与利用太阳能的利用有关。教育工作利用了UT-Austin的大一新生研究计划（FRI），该计划旨在带来能力不足的学生人群，否则可能不会将研究作为研究实验室的职业目标。该奖项是由化学系的大分子，超分子和纳米化学计划颁发的，也是德克萨斯大学奥斯汀分校的戴维·范登·伯特（David Vanden Bout）。