Journal
CHEMICAL PHYSICS
Volume 339, Issue 1-3, Pages 86-93Publisher
ELSEVIER
DOI: 10.1016/j.chemphys.2007.06.029
Keywords
TiO2; iron doping; adsorption; sum-frequency generation spectroscopy
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Sum frequency generation (SFG) vibrational spectroscopy along with the molecular probe, methanol, has been used to investigate the surface chemistry of TiO2. Methanol on TiO2 has two adsorption modes: a molecular physisorption mode and a dissociative chemisorption mode. Doping TiO2 with iron leads to quenching of the dissociative adsorption. Electron paramagnetic resonance (EPR) spectra of iron-doped TiO2 particles (particle size > 100 nm) compared to the same particles leached with water show that at least some of the iron is located on the surface. Particles are also characterized with UV-visible spectroscopy. (C) 2007 Elsevier B.V. All rights reserved.
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