title: Atomic Layer Deposition Al2O3Coatings Significantly Improve Thermal, Chemical, and Mechanical Stability of Anodic TiO2Nanotube Layers.
abstract: We report on a very significant enhancement of the thermal, chemical, and mechanical stability of self-organized TiO2nanotubes layers, provided by thin Al2O3coatings of different thicknesses prepared by atomic layer deposition (ALD). TiO2nanotube layers coated with Al2O3coatings exhibit significantly improved thermal stability as illustrated by the preservation of the nanotubular structure upon annealing treatment at high temperatures (870 °C). In addition, a high anatase content is preserved in the nanotube layers against expectation of the total rutile conversion at such a high temperature. Hardness of the resulting nanotube layers is investigated by nanoindentation measurements and shows strongly improved values compared to uncoated counterparts. Finally, it is demonstrated that Al2O3coatings guarantee unprecedented chemical stability of TiO2nanotube layers in harsh environments of concentrated H3PO4solutions.
authors.affiliation: Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice , nam. Cs. legii 565, 53002 Pardubice, Czech Republic.
authors.forename: Raul
authors.initials: R
authors.lastname: Zazpe
authors.affiliation: Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice , nam. Cs. legii 565, 53002 Pardubice, Czech Republic.
authors.forename: Jan
authors.initials: J
authors.lastname: Prikryl
authors.affiliation: Laboratory of Nanostructures and Nanomaterials, Institute of Physics of the CAS , v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic.
authors.forename: Viera
authors.initials: V
authors.lastname: Gärtnerova
authors.forename: Katerina
authors.initials: K
authors.lastname: Nechvilova
authors.affiliation: Joint laboratory of Solid-State Chemistry, Faculty of Chemical Technology, University of Pardubice , Studentska 95, 532 10 Pardubice, Czech Republic.
authors.forename: Ludvik
authors.initials: L
authors.lastname: Benes
authors.affiliation: Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice , nam. Cs. legii 565, 53002 Pardubice, Czech Republic.
authors.forename: Lukas
authors.initials: L
authors.lastname: Strizik
authors.affiliation: Laboratory of Nanostructures and Nanomaterials, Institute of Physics of the CAS , v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic.
authors.forename: Ales
authors.initials: A
authors.lastname: Jäger
authors.affiliation: Beneq, Olarinluoma 9, 02201 Espoo, Finland.
authors.forename: Markus
authors.initials: M
authors.lastname: Bosund
authors.affiliation: Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice , nam. Cs. legii 565, 53002 Pardubice, Czech Republic.
authors.forename: Hanna
authors.initials: H
authors.lastname: Sopha
authors.affiliation: Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice , nam. Cs. legii 565, 53002 Pardubice, Czech Republic.
authors.forename: Jan M
authors.identifier: 0000-0001-7091-3022
authors.initials: JM
authors.lastname: Macak