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  Charge trapping and photoadsorption of O2 on dehydroxylated TiO2 nanocrystals - An electron paramagnetic resonance study

Berger, T., Sterrer, M., Diwald, O., & Knözinger, E. (2005). Charge trapping and photoadsorption of O2 on dehydroxylated TiO2 nanocrystals - An electron paramagnetic resonance study. ChemPhysChem, 6(10), 2104-2112. doi:10.1002/cphc.200500161.

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 Urheber:
Berger, Thomas, Autor
Sterrer, Martin1, Autor           
Diwald, Oliver, Autor
Knözinger, Erich, Autor
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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Schlagwörter: charge transfer; EPR spectroscopy; oxygen; TiO2 nanocrystals; UV-induced charge separation; charge transfer; EPR spectroscopy; oxygen; TiO2; UV-induced charge separation; gas-phase photooxidation; reduced titanium-dioxide; nanostructured TiO2; heterogeneous photocatalysis; surface-properties; rutile surfaces; hydroxyl-groups; spin-resonance; colloidal TiO2; particle-size
 Zusammenfassung: The interaction of photogenerated charges with molecular oxygen was investigated on TiO2 nonocrystals by means of paramagnetic resonance (EPR) spectroscopy. Compared to photoactivation experiments in Vacuum at p < 10(-6) mbar and T = 740 K, the presence of O-2 enhances the concentration of persistently trapped electron and hole centres-by a factor of ten-due to the formation of adsorbed O-2(-) species. The photoadsorption of oxygen was also tracked quantitatively by pressure measurements, and the number of trapped charges, hole centres and 0,was found to correspond to ten electron-hole pairs per TiO2 nanocrystal. Conversely, in experiments at p < 10(-6) mbar with one trapped electron-hole pair per particle, charge separation is not persistent and completely reversible with respect to temperature. Heating to 298 K causes the total annihilation of photogenerated and trapped charges.

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Sprache(n): eng - English
 Datum: 2005-10-14
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Art des Abschluß: -

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Titel: ChemPhysChem
  Alternativer Titel : ChemPhysChem
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 6 (10) Artikelnummer: - Start- / Endseite: 2104 - 2112 Identifikator: -