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RESEARCH PRODUCT
Dependence of Exciton Mobility on Structure in Single-Walled Carbon Nanotubes
R. Bruce WeismanSergei M. BachiloAnni J. SiitonenAnni J. SiitonenDmitri A. Tsyboulskisubject
PhotoluminescenceMaterials scienceCondensed Matter::OtherExcitonSelective chemistry of single-walled nanotubesMechanical properties of carbon nanotubesCarbon nanotubeCondensed Matter::Mesoscopic Systems and Quantum Hall EffectMolecular physicslaw.inventionOptical properties of carbon nanotubesCondensed Matter::Materials ScienceCarbon nanobudlawGeneral Materials ScienceBallistic conduction in single-walled carbon nanotubesPhysical and Theoretical Chemistrydescription
Optically generated excitons in semiconducting single-walled carbon nanotubes (SWCNTs) display substantial diffusional mobility. This property allows excitons to encounter ∼104 carbon atoms during their lifetime and accounts for their efficient deactivation by sparse quenching sites. We report here experimental determinations of the mobilities of optically generated excitons in 10 different (n,m) species of semiconducting SWCNTs. Exciton diffusional ranges were deduced from measurements of stepwise photoluminescence quenching in selected individual SWCNTs coated with sodium deoxycholate surfactant and immobilized in agarose gel. A refined data analysis method deduced mean exciton ranges from 190 to 370 nm. The results suggest that exciton range increases weakly with nanotube diameter over the 0.7−1.2 nm diameter range and that species with near-armchair roll-up angles have the smallest exciton ranges. No significant correlation was found between the exciton range and measured photoluminescence action cros...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-07-01 | The Journal of Physical Chemistry Letters |