Stepwise quenching of exciton fluorescence in carbon nanotubes by single-molecule reactions

被引：403

作者：

Cognet, Laurent ^{[1
]}

Tsyboulski, Dmitri A.

Rocha, John-David R.

Doyle, Condell D.

Tour, James M.

Weisman, R. Bruce

机构：

[1] Univ Bordeaux 1, Ctr Phys Mol Opt & Hertzienne, F-33405 Talence, France

[2] CNRS, F-33405 Talence, France

[3] Rice Univ, Dept Chem, Ctr Biol & Environm Nanotechnol, Houston, TX 77005 USA

[4] Rice Univ, RE Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA

来源：

SCIENCE | 2007年 / 316卷 / 5830期

关键词：

D O I：

10.1126/science.1141316

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Single-molecule chemical reactions with individual single-walled carbon nanotubes were observed through near-infrared photoluminescence microscopy. The emission intensity within distinct submicrometer segments of single nanotubes changed in discrete steps after exposure to acid, base, or diazonium reactants. The steps were uncorrelated in space and time and reflected the quenching of mobile excitons at localized sites of reversible or irreversible chemical attack. Analysis of step amplitudes revealed an exciton diffusional range of about 90 nanometers, independent of nanotube structure. Each exciton visited about 10,000 atomic sites during its lifetime, providing highly efficient sensing of local chemical and physical perturbations.

引用

页码：1465 / 1468

页数：4

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