Reconsideration of Intrinsic Band Alignments within Anatase and Rutile TiO2

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 ...

Band Alignment and Controllable Electron Migration between Rutile and Anatase TiO2

TiO2 is the most promising semiconductor for photocatalytic splitting of water for hydrogen and degradation of pollutants. The highly photocatalytic active form is its mixed phase of two polymorphs anatase and rutile rather than their pristine compositions. Such a synergetic effect is understood by the staggered band alignment favorable to spatial charge separation. However, electron migration ...

In situ characterization of the deposition of anatase TiO2 on rutile TiO2(110)

Preparation and photoactivity of nanostructured anatase, rutile and brookite TiO2 thin films.

Photoactive films consisting of pure anatase, brookite or rutile TiO2 were prepared by dip coating from water dispersions obtained by using TiCl4 as the precursor under similar mild experimental conditions.

Raman generation of coherent phonons of anatase and rutile TiO2 photoexcited at fundamental absorption edges

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...