Journal
CHEMICAL PHYSICS LETTERS
Volume 477, Issue 1-3, Pages 135-138Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2009.06.050
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N-doped titanium dioxide has been prepared generating a nitrogen plasma in the atmosphere over a sample of pre-reduced TiO2. This solid, investigated by EPR and XPS, is similar to materials prepared via sol-gel or different chemical methods. The cleaner preparation method, however, avoids complications in the assignments due to by-products of the chemical synthesis. The experiment unambiguously confirms previous theoretical forecast and indicates the formation of an interstitial paramagnetic nitrogen species already described in the case of sol-gel prepared materials. The energy of this species lies slightly over the valence band limit and well below the Ti3+ states of reduced TiO2. (C) 2009 Elsevier B. V. All rights reserved.
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