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Issue 21, 2018
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Morphology control of anatase TiO2 for well-defined surface chemistry

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Abstract

A specific allotrope of titanium dioxide (anatase) was synthesized both with a standard thermodynamic morphology ({101}-anatase) and with a highly anisotropic morphology ({001}-anatase) dominated by the {001} facet (81%). The surface chemistry of both samples after dehydroxylation was studied by 1H NMR and FT-IR. The influence of surface fluorides on the surface chemistry was also studied by 1H NMR, FT-IR and DFT. Full attribution of the IR spectra of anatase with dominant {001} facets could be provided based on experimental data and further confirmed by DFT. Our results showed that chemisorbed H2O molecules are still present on anatase after dehydroxylation at 350 °C, and that the type of surface hydroxyls present on the {001} facet is dependent on the presence of fluorides. They also provided general insight into the nature of the surface species on both fluorinated and fluorine-free anatase. The use of vanadium oxychloride (VOCl3) allowed the determination of the accessibility of the various OH groups spectroscopically observed.

Graphical abstract: Morphology control of anatase TiO2 for well-defined surface chemistry

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Publication details

The article was received on 27 Mar 2018, accepted on 01 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8CP01983E
Citation: Phys. Chem. Chem. Phys., 2018,20, 14362-14373
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    Morphology control of anatase TiO2 for well-defined surface chemistry

    G. Jeantelot, S. Ould-Chikh, J. Sofack-Kreutzer, E. Abou-Hamad, D. H. Anjum, S. Lopatin, M. Harb, L. Cavallo and J. Basset, Phys. Chem. Chem. Phys., 2018, 20, 14362
    DOI: 10.1039/C8CP01983E

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