Photosensitized singlet oxygen production upon two-photon excitation of single-walled carbon nanotubes and their functionalized analogues

Naveen Gandra, Pui Lam Chiu, Wenbing Li, Yolanda R. Anderson, Somenath Mitra, Huixin He, Ruomei Gao

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Single-walled carbon nanotubes (SWNTs) functionalized with -COOH (along with some sulfonation and nitration) and/or modified with chitosan were prepared and tested for their singlet oxygen ( 1O 2) production. The emission from 1O 2 observed upon SWNT irradiation at 532 nm was due to a two-photon process, while 1O2 production via excitation at 355 nm occurred through a conventional one-photon pathway. The relative quantum yield of 1O 2 production at excitation wavelength of 532 nm was found to be 0.00, 0.07-0.13, and 0.24-0.53 for highly functionalized, partially functionalized, and nonfunctionalized SWNT samples, respectively. The nanotube-mediated generation of 1O 2 may find applications in both targeted destruction of tumor cells and selective degradation of drug molecules. Our research provides a practical approach to modulate the production of reactive oxygen species from SWNTs via surface functionalization/ modification.

Original languageEnglish (US)
Pages (from-to)5182-5185
Number of pages4
JournalJournal of Physical Chemistry C
Volume113
Issue number13
DOIs
StatePublished - Apr 2 2009

All Science Journal Classification (ASJC) codes

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

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