title: Surfactant-dependent exciton mobility in single-walled carbon nanotubes studied by single-molecule reactions.
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.
authors.affiliation: Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA.
authors.forename: Anni J
authors.initials: AJ
authors.lastname: Siitonen
authors.forename: Dmitri A
authors.initials: DA
authors.lastname: Tsyboulski
authors.forename: Sergei M
authors.initials: SM
authors.lastname: Bachilo
authors.forename: R Bruce
authors.initials: RB
authors.lastname: Weisman
mesh_terms: D003460:Crystallization / Q000379:methods*; D008027:Light; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D015336:Molecular Probe Techniques; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D012542:Scattering, Radiation; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D013501:Surface-Active Agents