Exciton dynamics and energies in single carbon nanotubes

单碳纳米管中的激子动力学和能量

• 批准号: 62113739
• 负责人: Professor Dr. Achim Hartschuh
• 金额: --
• 依托单位: Department Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/62113739?language=en
• 关键词: Exciton; dynamics; energies; single; carbon

Based on their exceptional optical properties, carbon nanotubes play an important role as nanometer-scale building-blocks for optoelectronics, nanoelectronics and biosensing. Optical excitation of nanotubes generates excitons that determine all light-based applications. We propose to study excitons in nanotubes on ultrafast timescales using a novel type of interferometric white-light scattering microscopy that provides ultimate detection sensitivity. First, the optical response of single nanotubes, a fingerprint of the nanotube structure, is determined quantitatively by detecting Rayleigh scattering spectra. Scattering spectra taken at different time delays after pulsed excitation then reveal energies and population dynamics of photo-generated states. We determine the correlation between the exciton decay and the nanotube structure for a broad diameter range for first the time and study energy transfer interactions between nanotubes within single bundles of known composition. Our results will allow us to identify different nonradiative decay channels that limit the widespread use of nanotubes in optical devices. In addition, our work will contribute to the development of the novel microscopy technique that is expected to have a major impact on the field of ultrafast processes in single nanoscale systems

基于其独特的光学特性，碳纳米管在光电子学、纳米电子学和生物传感领域扮演着重要的纳米级构建模块的角色。纳米管的光激发产生的激子决定了所有基于光的应用。我们建议使用一种新型的干涉白光散射显微镜在超快时间尺度上研究纳米管中的激子，该显微镜提供了最终的检测灵敏度。首先，通过检测纳米管的瑞利散射光谱，定量地确定了单个纳米管的光学响应，这是纳米管结构的指纹。脉冲激发后不同时间延迟的散射光谱揭示了光生态的能量和居群动力学。我们首次确定了宽直径范围内激子衰变与纳米管结构之间的相关性，并研究了已知组成的单束纳米管之间的能量传递相互作用。我们的研究结果将使我们能够识别出限制纳米管在光学器件中广泛使用的不同的非辐射衰减通道。此外，我们的工作将有助于新型显微技术的发展，预计将对单纳米级系统的超快过程领域产生重大影响

项目成果

Controlling exciton decay dynamics in semiconducting single-walled carbon nanotubes by surface acoustic waves

通过表面声波控制半导体单壁碳纳米管中的激子衰变动力学

• DOI: 10.1016/j.chemphys.2012.10.014
• 发表时间: 2012
• 期刊: Chemical Physics
• 影响因子: 2.3
• 作者: M. E. Regler;H. J. Krenner;A. A. Green;M. C. Hersam;A. Wixforth;A. Hartschuh
• 通讯作者: A. Hartschuh