Mesoporous TiO 2 anatase films for enhanced photocatalytic activity under UV and visible light

Olga Ishchenko (1, 2) , Guillaume Lamblin (2) , Jérôme Guillot (2) , Infante Ingrid C. (3) , Maël Guennou (4) , Noureddine Adjeroud (2) , Ioana Fechete (1, 5) , Francois Garin (1) , Philippe Turek (6) , Damien Lenoble (2)

1 ICPEES - Institut de chimie et procédés pour l'énergie, l'environnement et la santé
2 LIST - Luxembourg Institute of Science and Technology
3 INL - DE - INL - Dispositifs Electroniques
4 University of Luxembourg [Luxembourg]
5 LASMIS - Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée
6 Institut de Chimie de Strasbourg

films with enhanced photocatalytic activity in both UV and visible wavelength ranges were developed through a non-conventional atomic layer deposition (ALD) process at room temperature. Deposition at such a low temperature promotes the accumulation of by-products in the amorphous TiO 2 films, caused by the incomplete hydrolysis of the TiCl 4 precursor. The additional thermal annealing induces the fast recrystallisation of amorphous films, as well as an in situ acidic treatment of TiO 2. The interplay between the deposition parameters, such as purge time, the amount of structural defects introduced and the enhancement of the photocatalytic properties from different mesoporous films clearly shows that our easily upscalable non-conventional ALD process is of great industrial interest for environmental remediation and other photocatalytic applications, such as hydrogen production.

Domaines: Science des matériaux [cond-mat.mtrl-sci]; Matériaux; Matériaux; Micro et nanotechnologies/Microélectronique

Olga Ishchenko, Guillaume Lamblin, Jérôme Guillot, Infante Ingrid C., Maël Guennou, et al.. Mesoporous TiO 2 anatase films for enhanced photocatalytic activity under UV and visible light. RSC Advances, 2020, 10 (63), pp.38233-38243. ⟨10.1039/d0ra06455f⟩. ⟨hal-03045616⟩