Nano Archive

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

Cognet, Laurent and Tsyboulski, Dmitri A. and Rocha, John-David R. and Doyle, Condell D. and Tour, James M. and Weisman, R. Bruce (2007) Stepwise quenching of exciton fluorescence in carbon nanotubes by single-molecule reactions. SCIENCE, 316 (5830). pp. 1465-1468.

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Official URL: http://dx.doi.org/10.1126/science.1141316

Abstract

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.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:3052
Deposited By:Anuj Seth
Deposited On:13 Jan 2009 16:07
Last Modified:20 Jan 2009 15:45

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