Surfactant-dependent exciton mobility in single-walled carbon nanotubes studied by single-molecule reactions.
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.
Siitonen
Anni J
AJ
Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, Texas 77005, USA.
Tsyboulski
Dmitri A
DA
Bachilo
Sergei M
SM
Weisman
R Bruce
RB
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*
D037742:Nanotubes, Carbon; D013501:Surface-Active Agents