4-Mercaptobenzoic Acid Adsorption on TiO 2 Anatase (101) and TiO 2 Rutile (110) Surfaces

Compeán-González, Claudia Lorena, Thomas, Andrew Guy, Syres, Karen orcid iconORCID: 0000-0001-7439-475X, Cole, Jordan and Li, Zheshen (2022) 4-Mercaptobenzoic Acid Adsorption on TiO 2 Anatase (101) and TiO 2 Rutile (110) Surfaces. Surfaces, 5 (2). pp. 238-250.

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Official URL: https://doi.org/10.3390/surfaces5020017

Abstract

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.


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