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Adsorption Studies of p-Aminobenzoic Acid on the Anatase TiO2(101) Surface

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Author

  • Andrew G. Thomas
  • Mark J. Jackman
  • Michael Wagstaffe
  • Hanna Radtke
  • Karen Syres
  • Johan Adell
  • Anna Levy
  • Natalia Martsinovich

Summary, in English

The adsorption of p-aminobenzoic acid (pABA) on the anatase TiO2(101) surface has been investigated using synchrotron radiation photoelectron spectroscopy, near edge X-ray absorption fine structure (NEXAFS) spectroscopy, and density functional theory (DFT). Photoelectron spectroscopy indicates that the molecule is adsorbed in a bidentate mode through the carboxyl group following deprotonation. NEXAFS spectroscopy and DFT calculations of the adsorption structures indicate the ordering of a monolayer of the amino acid on the surface with the plane of the ring in an almost upright orientation. The adsorption of pABA on nanoparticulate TiO2 leads to a red shift of the optical absorption relative to bare TiO2 nanoparticles. DFT and valence band photoelectron spectroscopy suggest that the shift is attributed to the presence of the highest occupied molecular orbitals in the TiO2 band gap region and the presence of new molecularly derived states near the foot of the TiO2 conduction band.

Department/s

Publishing year

2014

Language

English

Pages

12306-12314

Publication/Series

Langmuir

Volume

30

Issue

41

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Sciences
  • Natural Sciences

Status

Published

ISBN/ISSN/Other

  • ISSN: 0743-7463