4-Mercaptobenzoic Acid Adsorption on TiO<sub>2</sub> Anatase (101) and TiO<sub>2</sub> Rutile (110) Surfaces
Claudia Lorena Compeán-González,
Andrew Guy Thomas,
Karen Louise Syres,
Jordan Cole,
Zheshen Li
Affiliations
Claudia Lorena Compeán-González
Department of Materials, School of Natural Sciences, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
Andrew Guy Thomas
Department of Materials, School of Natural Sciences, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
Karen Louise Syres
Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy, School of Natural Sciences, Faculty of Science and Technology, University of Central Lancashire, Fylde Road, Preston PR1 2HE, UK
Jordan Cole
Jeremiah Horrocks Institute for Mathematics, Physics and Astronomy, School of Natural Sciences, Faculty of Science and Technology, University of Central Lancashire, Fylde Road, Preston PR1 2HE, UK
Zheshen Li
Department of Physics and Astronomy, Centre for Storage Ring Facilities (ISA), Aarhus University, 8000 Aarhus, Denmark
The adsorption of 4-mercaptobenzoic acid (4-MBA) on anatase (101) and rutile (110) TiO2 surfaces has been studied using synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy techniques. Photoelectron spectroscopy results suggest that the 4-MBA molecule bonds to both TiO2 surfaces through the carboxyl group, following deprotonation in a bidentate geometry. Carbon K-edge NEXAFS spectra show that the phenyl ring of the 4-MBA molecule is oriented at 70° ± 5° from the surface on both the rutile (110) and anatase (101) surfaces, although there are subtle differences in the electronic structure of the molecule following adsorption between the two surfaces.
