4-Mercaptobenzoic Acid Adsorption on TiO<sub>2</sub> Anatase (101) and TiO<sub>2</sub> Rutile (110) Surfaces
The adsorption of 4-mercaptobenzoic acid (4-MBA) on anatase (101) and rutile (110) TiO<sub>2</sub> surfaces has been studied using synchrotron radiation photoelectron spectroscopy and near-edge X-ray absorption fine structure (NEXAFS) spectroscopy techniques. Photoelectron spectroscopy r...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-04-01
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| Series: | Surfaces |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2571-9637/5/2/17 |
| Summary: | The adsorption of 4-mercaptobenzoic acid (4-MBA) on anatase (101) and rutile (110) TiO<sub>2</sub> 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 TiO<sub>2</sub> 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. |
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| ISSN: | 2571-9637 |