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

Document Type

Article

Publication Date

4-2-2009

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. © 2009 American Chemical Society.

Identifier

65249124053 (Scopus)

Publication Title

Journal of Physical Chemistry C

External Full Text Location

https://doi.org/10.1021/jp809268q

e-ISSN

19327455

ISSN

19327447

First Page

5182

Last Page

5185

Issue

13

Volume

113

This document is currently not available here.

Share

COinS