通过单分子反应研究表面活性剂依赖性激子迁移率在单壁碳纳米管中的作用。

Surfactant-dependent exciton mobility in single-walled carbon nanotubes studied by single-molecule reactions.

机构信息

Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA.

出版信息

Nano Lett. 2010 May 12;10(5):1595-9. doi: 10.1021/nl9039845.

DOI:10.1021/nl9039845

PMID:20377240

Abstract

Measurements of stepwise photoluminescence quenching in individual, (n,m)-selected single-walled carbon nanotubes (SWCNTs) undergoing chemical reaction have been analyzed to deduce mobilities of optically generated excitons. For (7,5) nanotubes, the mean exciton range varies between approximately 140 and 240 nm for different surfactant coatings and correlates weakly with nanotube PL intensity. The results are consistent with a model of localized SWCNT excitons having substantial diffusional mobility along the nanotube axis.

摘要

对经历化学反应的（n,m）-选择的单个单壁碳纳米管（SWCNT）的逐步光致荧光猝灭进行了测量，以推断光生激子的迁移率。对于（7,5）纳米管，不同表面活性剂涂层的平均激子范围在大约 140nm 到 240nm 之间变化，与纳米管 PL 强度的相关性较弱。结果与沿纳米管轴具有显著扩散迁移率的局域 SWCNT 激子模型一致。