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

Abstract : 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 °C, their effect on formic acid’s degradation under UV light was negligible. However, when the films were annealed at 500 °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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https://hal-ujm.archives-ouvertes.fr/ujm-03804992
Contributor : Francis VOCANSON Connect in order to contact the contributor
Submitted on : Friday, October 21, 2022 - 11:22:54 AM
Last modification on : Friday, October 21, 2022 - 1:24:19 PM

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Nicolas Crespo-Monteiro, Marwa Hamandi, Maria Alejandra Usuga Higuita, C. Guillard, Frederic Dappozze, et al.. Influence of the Micro-Nanostructuring of Titanium Dioxide Films on the Photocatalytic Degradation of Formic Acid under UV Illumination. Nanomaterials, 2022, 12 (6), pp.1008. ⟨10.3390/nano12061008⟩. ⟨ujm-03804992⟩

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