title: Adsorption of dopamine on rutile TiO2 (110): a photoemission and near-edge X-ray absorption fine structure study.
abstract: Synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) techniques have been used to study the adsorption of dopamine on a rutile TiO2 (110) single crystal. Photoemission results suggest that dopamine bonds through the oxygen molecules in a bidentate fashion. From the data, it is ambiguous whether the oxygens bond to the same 5-fold coordinated surface titanium atom or bridges across two, although based on the bonding of pyrocatechol on rutile TiO2 (110), it is likely that the dopamine bridges two titanium atoms. Using the searchlight effect, the carbon K-edge near-edge X-ray absorption fine structure NEXAFS spectra recorded for dopamine on rutile TiO2 (110) show the phenyl ring to be oriented at 78° ± 5° from the surface and twisted 11 ± 10° relative to the (001) direction.
authors.affiliation: School of Physics and Astronomy and Photon Science Institute, Alan Turing Building, The University of Manchester , Oxford Road, Manchester M13 9PL, UK.
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Jackman
authors.forename: Karen L
authors.initials: KL
authors.lastname: Syres
authors.forename: David J H
authors.initials: DJ
authors.lastname: Cant
authors.forename: Samantha J O
authors.initials: SJ
authors.lastname: Hardman
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Thomas
mesh_terms: D000327:Adsorption; D002244:Carbon / Q000737:chemistry; D018360:Crystallography, X-Ray; D004298:Dopamine / Q000737:chemistry*; D008968:Molecular Conformation; D053758:Nanoparticles / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D056951:Photoelectron Spectroscopy; D013499:Surface Properties; D013816:Thermodynamics; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D002244:Carbon; D014025:Titanium; D010100:Oxygen; D004298:Dopamine