2000
DOI: 10.1021/jp9943272
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The Influence of the Bulk Reduction State on the Surface Structure and Morphology of Rutile TiO2(110) Single Crystals

Abstract: We have investigated the relationship between different types and amounts of bulk defects and the surface morphology of TiO 2 (110) single crystals prepared by annealing in ultrahigh vacuum and in oxygen. Rutile TiO 2 (110) specimens were cut from the same crystal and were heated in a furnace to different temperatures which resulted in different states of reduction (colors of the crystals). After characterization of the bulk defects with electron paramagnetic resonance (EPR), the specimens were studied with sc… Show more

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Cited by 209 publications
(174 citation statements)
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“…S6, A and B We propose that the surface redox chemistry on reduced titania is to a large extent associated with Ti interstitials in the near-surface region, because these defect sites provide the electronic charge, enabling important reactions. This conclusion is consistent with numerous experimental studies addressing the Ti3d defect state, including the pioneering work by Henrich et al (5, 8), electron paramagnetic resonance spectroscopy (35)(36)(37), bulk photonic (38) and transport (39) studies, recent photoelectron diffraction studies (40), and thin-film growth studies (41).…”
supporting
confidence: 88%
“…S6, A and B We propose that the surface redox chemistry on reduced titania is to a large extent associated with Ti interstitials in the near-surface region, because these defect sites provide the electronic charge, enabling important reactions. This conclusion is consistent with numerous experimental studies addressing the Ti3d defect state, including the pioneering work by Henrich et al (5, 8), electron paramagnetic resonance spectroscopy (35)(36)(37), bulk photonic (38) and transport (39) studies, recent photoelectron diffraction studies (40), and thin-film growth studies (41).…”
supporting
confidence: 88%
“…222,230,231 Thin-film vanadia on Rh(111), for example, undergoes several phase transition upon reduction, transforming from a VO 2 into a V 2 O 3 -like structure with one and 0.5 V=O groups per surface V atom, respectively. In higher reduction stages, different surface oxides without V=O groups develop until finally a plain VO layer is formed ( Fig.…”
mentioning
confidence: 99%
“…1,2 Though a large number of papers have been published on titania photocatalysis, the essence of its photocatalytic activity, e.g., the reason of various levels of photocatalytic activity of samples with various properties and polymorphic composition, has not been clarified. 3 Recently, crystallite morphology, which has been widely studied for reactions occurring on a titania single crystal (mainly rutile (110)) 4 but neglected for particulate photocatalysts, has been considered as one of the crucial factors affecting the photocatalytic activity of particulate titania on the basis of the results of studies performed using facetted octahedral 57 and decahedral 810 anatase particles. We have recently developed an ultrasonication (US)hydrothermal reaction (HT) process 11 to prepare octahedral anatase particles (OAPs), exposing eight themodynamically most stable equivalent {101} facets, with enhanced photocatalytic activity, especially for the oxidation of acetic acid in aerated aqueous solutions, compared with many commercial titania samples with similar properties.…”
mentioning
confidence: 99%