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Photocatalytic TiO2 thin films synthesized by the post-discharge of an RF atmospheric plasma torch

par Collette, Stephanie ;Reniers, François ;Hubert, Julie ;Batan, Abdelkrim ;Baert, Kitty;Raes, Marc H W M.;Vandendael, Isabelle;Daniel, Alain ;Archambeau, Catherine;Terryn, Herman
Référence Surface & coatings technology, 289, page (172-178)
Publication Publié, 2016-03

Article révisé par les pairs

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Résumé :

Thin films of titanium oxide (TiO2) are synthesized at room temperature by the post-discharge of an RF atmospheric plasma torch supplied with argon and oxygen. Vapours of titanium tetraisopropoxide (TTIP) precursor are injected in the post-discharge by an argon flow rate bubbling in the liquid precursor. Without any external substrate heating, the coatings are amorphous and characterized by a thin film upon which agglomerates can be observed. The annealing of the coatings at 450 °C is efficient to (partially) crystallize the TiO2 since bands characteristic of the TiO2 anatase structure are observed in Raman spectra. The films are super-hydrophilic and present excellent photocatalytic activity; two properties of particular interest for self-cleaning applications. Nevertheless, annealed coating presents a higher photocatalytic activity.