Strong polaronic effects on rutile TiO2 electronic band edges
نویسندگان
چکیده
منابع مشابه
Band alignment of rutile and anatase TiO2
The most widely used oxide for photocatalytic applications owing to its low cost and high activity is TiO2. The discovery of the photolysis of water on the surface of TiO2 in 19721 launched four decades of intensive research into the underlying chemical and physical processes involved2–5. Despite much collected evidence, a thoroughly convincing explanation of why mixed-phase samples of anatase ...
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Surface defects are known to dominate both the electronic and chemical properties of metal oxide surfaces, an object of much study for use in catalytic processes. In order to study surface chemistry in detail, an ultra-high vacuum (UHV) chamber was designed to combine a LEED and STM system. Construction is underway, with a reported initial base pressure of 10−9 Torr revealing no major leaks. On...
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Ultrafast phonon dynamics in anatase and rutile TiO2 single crystals are investigated using 400 nm near ultraviolet light pulses, whose wavelength corresponds to the fundamental absorption edges of both polymorphs. Raman-active phonon modes are observed as coherent modulations in THz frequency range of the reflected light intensity. Coherent amplitudes vary as the crystals are rotated with resp...
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Oxygen vacancies created in anatase TiO(2) by UV photons (80-130 eV) provide an effective electron-doping mechanism and induce a hitherto unobserved dispersive metallic state. Angle resolved photoemission reveals that the quasiparticles are large polarons. These results indicate that anatase can be tuned from an insulator to a polaron gas to a weakly correlated metal as a function of doping and...
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The interactions of ethylene glycol with a partially reduced rutile TiO2(110) surface have been studied using temperature programmed desorption (TPD). The saturation coverage on surface Ti rows is determined to be 0.43 monolayer (ML), slightly less than one ethylene glycol per two Ti sites. Most of the adsorbed ethylene glycol (∼80%) undergoes further reactions to yield other products. Two majo...
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ژورنال
عنوان ژورنال: Applied Physics Letters
سال: 2005
ISSN: 0003-6951,1077-3118
DOI: 10.1063/1.1940739