Dynamics of localized charges in dopamine-modified TiO and their effect on the formation of reactive oxygen species

Nada M. Dimitrijevic, Elena Rozhkova, Tijana Rajh

Research output: Contribution to journalArticlepeer-review

125 Scopus citations

Abstract

Modification of TiO 2 nanoparticles with dopamine enables harvesting of visible light and promotes spatial separation of charges. The formation of reactive oxygen species (OH, 1O 2, O 2 -, HO 2, H 2O 2) upon illumination of TiO 2/dopamine was studied using complementary spin-trap EPR and radical-induced fluorescence techniques. The localization of holes on dopamine suppresses oxidation of adsorbed water molecules at the surface of nanoparticles, and thus formation of OH radicals. At the same time, dopamine does not affect electronic properties of photogenerated electrons and their reaction with dissolved oxygen to produce superoxide anions. Superoxide anions are proposed to generate singlet oxygen through dismutation reaction, resulting in a low yield of 1O 2 detected.

Original languageEnglish (US)
Pages (from-to)2893-2899
Number of pages7
JournalJournal of the American Chemical Society
Volume131
Issue number8
DOIs
StatePublished - Mar 4 2009
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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