Open AccessAdsorption of Dopamine on Rutile TiO2 (110): A Photoemission and Near-Edge X-ray Absorption Fine Structure Study
Author(s) -
Mark J. Jackman,
Karen L. Syres,
David J. H. Cant,
Samantha J. O. Hardman,
Andrew G. Thomas
Publication year - 2014
Publication title -
langmuir
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.042
H-Index - 333
eISSN - 1520-5827
pISSN - 0743-7463
DOI - 10.1021/la501357b
Subject(s) - xanes , rutile , adsorption , x ray photoelectron spectroscopy , absorption (acoustics) , extended x ray absorption fine structure , chemistry , absorption spectroscopy , synchrotron radiation , titanium , single crystal , crystallography , materials science , analytical chemistry (journal) , spectral line , nuclear magnetic resonance , organic chemistry , optics , physics , astronomy , composite material
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.
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