EPR study on paramagnetic species in nitrogen-doped ZnO powders prepared by a mechanochemical method

Shinya Moribe, Tadaaki Ikoma, Kimio Akiyama, Qiwu Zhang, Fumio Saito, Shozo Tero-Kubota

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

Paramagnetic species in nitrogen-doped ZnO (N-ZnO) powders, visible light sensitive photocatalysts exhibiting antibacterial activity, have been investigated using EPR spectroscopy. The N-ZnO photocatalysts showed two kinds of EPR signals due to a singly ionized nitrogen (N2-) and a shallow donor. Visible light irradiation to the N-ZnO particles shows reversible response of reduction of EPR signal of the N2- radical site and increase of that due to shallow donor. The results indicate that the N2- is converted to a diamagnetic neutral molecular nitrogen acceptor (N20) by visible light and photoinduced electrons are trapped to the shallow donor sites.

Original languageEnglish
Pages (from-to)373-377
Number of pages5
JournalChemical Physics Letters
Volume436
Issue number4-6
DOIs
Publication statusPublished - 2007 Mar 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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