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    Influence of the Micro-Nanostructuring of Titanium Dioxide Films on the Photocatalytic Degradation of Formic Acid under UV Illumination

    Year: 2022

    Journal: Nanomaterials, Volume 12, MAR

    Authors: Crespo-Monteiro, Nicolas; Hamandi, Marwa; Higuita, Maria Alejandra Usuga; Guillard, Chantal; Dappozze, Frederic; Jamon, Damien; Vocanson, Francis; Jourlin, Yves

    Organizations: French Centre National de la Recherche Scientifique (CNRS)

    Keywords: sol-gel; micro-nanostructuring; formic acid; photocatalysis

    Surface micro-nanostructuring can provide new functionalities and properties to coatings. For example, it can improve the absorption efficiency, hydrophobicity and/or tribology properties. In this context, we studied the influence of micro-nanostructuring on the photocatalytic efficiency of sol-gel TiO2 coatings during formic acid degradation under UV illumination. The micro-nanostructuring was performed using the UV illumination of microspheres deposited on a photopatternable sol-gel layer, leading to a hexagonal arrangement of micropillars after development. The structures and coatings were characterized using Raman spectroscopy, ellipsometry, atomic force microscopy and scanning electron microscopy. When the sol-gel TiO2 films were unstructured and untreated at 500 degrees C, their effect on formic acid's degradation under UV light was negligible. However, when the films were annealed at 500 degrees C, they crystallized in the anatase phase and affected the degradation of formic acid under UV light, also depending on the thickness of the layer. Finally, we demonstrated that surface micro-nanostructuring in the form of nanopillars can significantly increase the photocatalytic efficiency of a coating during the degradation of formic acid under UV light.
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