Aggregation-dependent photoluminescence sidebands in single-walled carbon nanotube

Li Wei, Lain-Jong Li, Mary B. Chan-Park, Yanhui Yang, Yuan Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Aggregation of single-walled carbon nanotubes (SWCNTs) is one of the major obstacles for many nanotube fundamental studies and practical applications, such as nanocomposites, electronic devices, bioimaging, biosensors, and drug-delivery. In this study, two types of SWCNT samples, enriched with (6,5) and (7,5) chiral structures, respectively, were investigated. SWCNT suspensions containing various fractions of bundles were obtained by ultracentrifugation. Dialysis was used to achieve the controlled nanotube rebundling. Results showed that SWCNT photoluminescence (PL) sidebands (the transverse sideband E 12,21, the phonon coupled sidebands E22 + G,G′, and the E33 → E11 emission band) are dependent on the nanotube aggregation. We proposed that SWCNT exciton relaxation routes increase upon nanotube aggregation, resulting in the suppression of primary PL peaks and the enhancement of PL sidebands. Furthermore, the correlation between PL sidebands and nanotube aggregation was also demonstrated in diverse dispersion conditions involving different surfactants and solvents. These results highlight the potential of employing PL sidebands as a sensitive characterizing tool to monitor the nanotube aggregation under different circumstances.

Original languageEnglish (US)
Pages (from-to)6704-6711
Number of pages8
JournalJournal of Physical Chemistry C
Issue number14
StatePublished - Apr 15 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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