Photoinduced electron paramagnetic resonance study of electron traps in TiO2 crystals: Oxygen vacancies and Ti3+ ions
作者： Shan Yang , L. E. Halliburton , A. Manivannan , P. H. Bunton , D. B. Baker
DOI: 10.1063/1.3124656
关键词: Electron paramagnetic resonance 、 Electron 、 Spectral line 、 Photochemistry 、 Rutile 、 Titanium 、 Atomic physics 、 Ionization 、 Ion 、 Oxygen 、 Chemistry
摘要: Electron paramagnetic resonance (EPR) is used to identify photoinduced titanium-associated electron traps in TiO2 crystals (rutile). Defect production occurs at low temperature with 442 nm laser light. Spectra S=1/2 and S=1 are assigned singly ionized neutral oxygen vacancies, respectively. These vacancies have their unpaired spins localized on the two neighboring titanium ions aligned along c axis. A Ti3+ ion next a Si4+ ion, self-trapped electron, hole shared by adjacent also observed. Isolated substitutional Fe3+ Cr3+ serve as traps.
scitation.org
harvard.edu
aip.org
sci-hub.se 
wvu.edu 参考文章(18)
K. T. Stevens, N. Y. Garces, L. E. Halliburton, M. Yan, N. P. Zaitseva, J. J. DeYoreo, G. C. Catella, J. R. Luken, Identification of the intrinsic self-trapped hole center in KD2PO4 Applied Physics Letters. ,vol. 75, pp. 1503- 1505 ,(1999) , 10.1063/1.124736
T. Purcell, R. A. Weeks, Paramagnetic Defects in TiO2 Produced by Radiation The Journal of Chemical Physics. ,vol. 54, pp. 2800- 2810 ,(1971) , 10.1063/1.1675259
B. W. Faughnan, Z. J. Kiss, Photoinduced Reversible Charge-Transfer Processes in Transition-Metal-Doped Single-Crystal SrTiO3and TiO2 Physical Review Letters. ,vol. 21, pp. 1331- 1334 ,(1968) , 10.1103/PHYSREVLETT.21.1331
Nick Serpone, Is the Band Gap of Pristine TiO2 Narrowed by Anion- and Cation-Doping of Titanium Dioxide in Second-Generation Photocatalysts? Journal of Physical Chemistry B. ,vol. 110, pp. 24287- 24293 ,(2006) , 10.1021/JP065659R
D. Zwingel, The structure of trapped hole centres in Al-doped TiO2 Solid State Communications. ,vol. 20, pp. 397- 400 ,(1976) , 10.1016/0038-1098(76)90534-2
M. Aono, R. R. Hasiguti, Interaction and ordering of lattice defects in oxygen-deficient rutile TiO2-x. Physical Review B. ,vol. 48, pp. 12406- 12414 ,(1993) , 10.1103/PHYSREVB.48.12406
H. J. Gerritsen, S. E. Harrison, H. R. Lewis, J. P. Wittke, Fine Structure, Hyperfine Structure, and Relaxation Times of Cr 3 + in Ti O 2 (Rutile) Physical Review Letters. ,vol. 2, pp. 153- 155 ,(1959) , 10.1103/PHYSREVLETT.2.153
Paul I. Kingsbury, W. D. Ohlsen, O. W. Johnson, Defects in Rutile. I. Electron Paramagnetic Resonance of Interstitially Doped n-Type Rutile Physical Review. ,vol. 175, pp. 1091- 1098 ,(1968) , 10.1103/PHYSREV.175.1091
Vyacheslav N. Kuznetsov, Nick Serpone, Visible Light Absorption by Various Titanium Dioxide Specimens Journal of Physical Chemistry B. ,vol. 110, pp. 25203- 25209 ,(2006) , 10.1021/JP064253B
Cristiana Di Valentin, Emanuele Finazzi, Gianfranco Pacchioni, Annabella Selloni, Stefano Livraghi, Maria Cristina Paganini, Elio Giamello, N-doped TiO2: Theory and experiment principles and practice of constraint programming. ,vol. 339, pp. 44- 56 ,(2007) , 10.1016/J.CHEMPHYS.2007.07.020