Visible light induced paramagnetic sites in nitrogen-doped TiO2 prepared by a mechanochemical method

Y. Yamamoto, S. Moribe, T. Ikoma, K. Akiyama, Q. Zhang, F. Saito, S. Tero-Kubota

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The radical sites generated by the visible light irradiation of nitrogen-doped TiO 2 particles prepared by a mechanochemical method have been studied using cw-EPR spectroscopy. The powders prepared by planetary milling of the anatase TiO 2 with urea clearly show an absorption in the visible region, indicating doping of nitrogen. Visible light irradiation with wavelengths longer than 420nm induces a nitrogen-centred radical site. The radical site is assigned to the interstitial radical. In the presence of air, a reversible response of the growth and decay of paramagnetic sites was observed during and after photolysis. In contrast, in degassed samples, the decay of the signals is accompanied by the concomitant growth of the neutral NO radical site after irradiation, suggesting breaking of the N-O bond.

Original languageEnglish
Pages (from-to)1733-1737
Number of pages5
JournalMolecular Physics
Issue number10-11
Publication statusPublished - 2006 May 20

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


Dive into the research topics of 'Visible light induced paramagnetic sites in nitrogen-doped TiO<sub>2</sub> prepared by a mechanochemical method'. Together they form a unique fingerprint.

Cite this