Photoinduced luminescence blinking and bleaching in individual single-walled carbon nanotubes

被引：33

作者：

Georgi, Carsten ^{[1
,2
]}

Hartmann, Nicolai ^{[1
,2
]}

Gokus, Tobias ^{[1
,2
]}

Green, Alexander A. ^{[3
]}

Hersam, Mark C. ^{[3
]}

Hartschuh, Achim ^{[1
,2
]}

机构：

[1] Univ Munich, Dept Chem & Biochem, D-81377 Munich, Germany

[2] Univ Munich, CENS, D-81377 Munich, Germany

[3] Northwestern Univ, Dept Mat Sci & Engn, Dept Chem, Evanston, IL 60208 USA

来源：

CHEMPHYSCHEM | 2008年 / 9卷 / 10期

关键词：

carbon nanotubes; chemisorption; luminescence; oxidation; quenching;

D O I：

10.1002/cphc.200800179

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The temporal evolution of photoluminescence in individual single-walled carbon nanotubes (SWNT) under strong laser irradiation is studied and pronounced blinking and bleaching is observed, caused by photoinduced oxidation that subsequently quenches mobile excitons. The nanotubes are isolated with sodium cholate and spun onto either a glass or mica surface. Their bleaching behavior is investigated for variable laser intensities in air and argon atmosphere. The decay rate for luminescence bleaching generally increases with higher laser intensity, however saturating on mica substrates, which is attributed to limited availability of oxygen in the vicinity of the nanotubes. Step-like events in the luminescence time traces corresponding to single oxidation events are analyzed regarding relative step height and suggest an exciton diffusion range of about 105 nm.

引用

页码：1460 / 1464

页数：5

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