6533b828fe1ef96bd12877bd
RESEARCH PRODUCT
Intrinsic Nature of the Excess Electron Distribution at theTiO2(110)Surface
Luca FloreanoPeter KrügerBruno DomenichiniSylvie BourgeoisAlberto MorganteJacques JupilleAlberto Verdinisubject
DiffractionWork (thermodynamics)AnataseMaterials scienceBand gapGeneral Physics and Astronomychemistry.chemical_element02 engineering and technologyElectron021001 nanoscience & nanotechnology01 natural sciencesIonAdsorptionchemistryChemical physics0103 physical sciencesAtomic physics010306 general physics0210 nano-technologyTitaniumdescription
The gap state that appears upon reduction of TiO2 plays a key role in many of titania's interesting properties but its origin and spatial localization have remained unclear. In the present work, the TiO2(110) surface is reduced in a chemically controlled way by sodium adsorption. By means of resonant photoelectron diffraction, excess electrons are shown to be distributed mainly on subsurface Ti sites strikingly similar to the defective TiO2(110) surface, while any significant contribution from interstitial Ti ions is discarded. In agreement with first principles calculations, these findings demonstrate that the distribution of the band gap charge is an intrinsic property of TiO2(110), independent of the way excess electrons are produced.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-03-20 | Physical Review Letters |