title: Dopamine adsorption on anatase TiO2(101): a photoemission and NEXAFS spectroscopy study.
abstract: The adsorption of dopamine onto an anatase TiO(2)(101) single crystal has been studied using photoemission and NEXAFS techniques. Photoemission results suggest that the dopamine molecule adsorbs on the surface in a bidentate geometry, resulting in the removal of band gap states in the TiO(2) valence band. Using the searchlight effect, carbon K-edge NEXAFS spectra indicate that the phenyl rings in the dopamine molecules are orientated normal to the surface. A combination of experimental and computational results indicates the appearance of new unoccupied states arising following adsorption. The possible role of these states in the charge-transfer mechanism of the dopamine-TiO(2) system is discussed.
authors.affiliation: School of Physics and Astronomy, The Photon Science Institute, Alan Turing Building, The University of Manchester, Oxford Road, Manchester M13 9PL, UK.
authors.forename: K
authors.initials: K
authors.lastname: Syres
authors.forename: A
authors.initials: A
authors.lastname: Thomas
authors.forename: F
authors.initials: F
authors.lastname: Bondino
authors.forename: M
authors.initials: M
authors.lastname: Malvestuto
authors.forename: M
authors.initials: M
authors.lastname: Grätzel
mesh_terms: D000327:Adsorption; D004298:Dopamine / Q000737:chemistry*; D004579:Electron Transport; D008958:Models, Molecular; D008968:Molecular Conformation; D056951:Photoelectron Spectroscopy; D011789:Quantum Theory; D014025:Titanium / Q000737:chemistry*; D056928:X-Ray Absorption Spectroscopy
chemical_list: C009495:titanium dioxide; D014025:Titanium; D004298:Dopamine