6533b7d5fe1ef96bd1264fd0

RESEARCH PRODUCT

Electronic exchanges between adsorbed Ni atoms and TiO2(110) surface evidenced by resonant photoemission

František ŠUtaraSylvie BourgeoisBruno DomenichiniTomáš SkálaVladimír Matolín

subject

RadiationMaterials scienceBand gapInverse photoemission spectroscopychemistry.chemical_elementAngle-resolved photoemission spectroscopyCondensed Matter PhysicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsIonNickelAbsorption edgechemistryMonolayerPhysical and Theoretical ChemistryAtomic physicsSpectroscopyTitanium

description

Abstract Nickel was deposited on stoichiometric TiO2(1 1 0) surface in the 0.02–2.1 equivalent monolayer (eqML) range and analyzed by means of photoemission and resonant photoemission. In the case of very low coverage (lower than 0.1 eqML), deposited nickel reacts with the surface through an electronic transfer from nickel atoms towards titanium ions. This exchange caused the filling of unoccupied Ti3d states leading to the increase of a peak in the TiO2 band gap. These states can be better characterized through resonant photoemission experiments at the Ti 3p → 3d absorption edge: for very low coverage, these states in the TiO2 band gap have resonant behavior of Ti3d electrons rather than Ni3d ones, confirming the filling of Ti3d states and thus electron transfer between nickel and titanium. For coverage higher than 0.14 eqML, nickel peaks (both Ni3p core level and valence band) should be related to the presence of metallic nickel in small clusters.

yearjournalcountryeditionlanguage
2011-07-01Journal of Electron Spectroscopy and Related Phenomena
https://doi.org/10.1016/j.elspec.2011.05.001