Chiral-selective protection of single-walled carbon nanotube photoluminescence by surfactant selection

Timothy J. McDonald, Jeffrey L. Blackburn, Wyatt K. Metzger, Gary Rumbles, Michael J. Heben

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We study the effects of adding H 2O 2 to acid-purified and unpurified single-walled carbon nanotubes (SWNTs) in aqueous suspensions using photoluminescence (PL) and optical absorption spectroscopies. The addition of H 2O 2 to suspensions of unpurified SWNTs results in a rapid (1-2 h) quenching of the photoluminescence from all tubes, whereas H 2O 2 addition to acid-purified SWNTs causes the nanotube PL to grow in intensity over a period of several days before decaying in a tube-specific manner that depends on the binding strength of the surfactant sheath. With the appropriate choice of surfactants, the PL for specific acid-purified SWNTs can be protected such that novel mid-gap and phonon-assisted absorption and emission transitions can be observed without the obscuring effects associated with emission from other nanotubes. The H 2O 2 treatment also results in a reduction of the high-energy absorption background that has been associated with either carbonaceous impurities or the SWNT π-plasmon oscillation. An understanding of the related mechanisms leads to a new method for separating nanotubes by type based on selective oxidation followed by selective precipitation. These findings offer the possibility of efficiently separating large quantities of nanotubes by chirality.

Original languageEnglish
Pages (from-to)17894-17900
Number of pages7
JournalJournal of Physical Chemistry C
Volume111
Issue number48
DOIs
Publication statusPublished - Dec 6 2007

Fingerprint

Single-walled carbon nanotubes (SWCN)
Surface-Active Agents
Photoluminescence
Surface active agents
carbon nanotubes
surfactants
Nanotubes
nanotubes
photoluminescence
acids
Acids
Suspensions
tubes
Chirality
energy absorption
Energy absorption
Absorption spectroscopy
chirality
sheaths
Light absorption

ASJC Scopus subject areas

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

Cite this

Chiral-selective protection of single-walled carbon nanotube photoluminescence by surfactant selection. / McDonald, Timothy J.; Blackburn, Jeffrey L.; Metzger, Wyatt K.; Rumbles, Gary; Heben, Michael J.

In: Journal of Physical Chemistry C, Vol. 111, No. 48, 06.12.2007, p. 17894-17900.

Research output: Contribution to journalArticle

McDonald, Timothy J. ; Blackburn, Jeffrey L. ; Metzger, Wyatt K. ; Rumbles, Gary ; Heben, Michael J. / Chiral-selective protection of single-walled carbon nanotube photoluminescence by surfactant selection. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 48. pp. 17894-17900.
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