Photoinduced luminescence blinking and bleaching in individual single-walled carbon nanotubes

Carsten Georgi, Nicolai Hartmann, Tobias Gokus, Alexander A. Green, Mark C. Hersam, Achim Hartschuh

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The temporal evolution of photoluminescence in individual single-walled carbon nanotubes (SWNT) under strong laser irradiation is studied and pronounced blinking and bleaching is observed, caused by photoinduced oxidation that subsequently quenches mobile excitons. The nanotubes are isolated with sodium cholate and spun onto either a glass or mica surface. Their bleaching behavior is investigated for variable laser intensities in air and argon atmosphere. The decay rate for luminescence bleaching generally increases with higher laser intensity, however saturating on mica substrates, which is attributed to limited availability of oxygen in the vicinity of the nanotubes. Step-like events in the luminescence time traces corresponding to single oxidation events are analyzed regarding relative step height and suggest an exciton diffusion range of about 105 nm.

Original languageEnglish
Pages (from-to)1460-1464
Number of pages5
JournalChemPhysChem
Volume9
Issue number10
DOIs
Publication statusPublished - Jul 14 2008

Keywords

  • Carbon nanotubes
  • Chemisorption
  • Luminescence
  • Oxidation
  • Quenching

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

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