The electronic structure of cluster assembled nanostructured Ti O2 thin films has been investigated by resonant photoemission experiments with photon energies across the Ti L2,3 edge. The samples were produced by supersonic cluster beam deposition with a pulsed microplasma cluster source. The valence band shows resonance enhancements in the binding energy region between 4 and 8 eV, populated by O 2p and hybridized Ti 3d states, and in the region about 1 eV below the Fermi level associated with defects related Ti 3d states. The data show that in as-deposited films Ti atoms are mainly fully (sixfolds) coordinated to oxygen atoms in octahedral symmetry and only a small fraction is in a broken symmetry environment. Since resonant photoemission is closely linked to the local electronic and structural configurations around the Ti atom, it is possible to correlate the resonant photoemission intensity and lineshape with the presence of defects of the films and with the degree of hybridization between the titanium and oxygen atoms.
|Titolo:||Electronic structure of cluster assembled nanostructured TiO2 by resonant photoemission at the Ti L-2,L-3 edge|
|Settore Scientifico Disciplinare:||Settore FIS/01 - Fisica Sperimentale|
Settore FIS/03 - Fisica della Materia
|Data di pubblicazione:||2008|
|Digital Object Identifier (DOI):||10.1063/1.2832321|
|Appare nelle tipologie:||01 - Articolo su periodico|