Title: Surface Wettability of ZnO-Loaded TiO2 Nanotube Array Layers
Authors: Dobromir, М.
Konrad-Soare, C.T.
Stoian, G.
Semchenko, A.V.
Kovalenko, D.L.
Luca, D.
Keywords: TiO2 nanotube array layers
ZnO loading
reactive RF magnetron sputtering
ZnO/TiO2 heterojunction
surface wettability
back reaction
Issue Date: 2020
Citation: Surface Wettability of ZnO-Loaded TiO2 Nanotube Array Layers / M. Dobromir [et. al.] // Nanomaterials. - 2020. - № 10. - С. [1-14].
Abstract: Herein we report on the synthesis and the effects of gradual loading of TiO2 nanotube array layers with ZnO upon surface wettability. Two-step preparation was chosen, where TiO2 nanotube layers, grown in a first instance by anodization of a Ti foil, were gradually loaded with controlled amounts of ZnO using the reactive RF magnetron sputtering. After crystallization annealing, the formerly amorphous TiO2 nanotubes were converted to predominantly anatase crystalline phase, as detected by XRD measurements. The as-prepared nanotubes exhibited a well-aligned columnar structure, 1.6 µm long and 88 nm in diameter, and a small concentration of oxygen vacancies. Ti2+ and Ti3+ occur along with the Ti4+ state upon sputter-cleaning the layer surfaces from contaminants. The Ti2+ and Ti3+ signals diminish with gradual ZnO loading. As demonstrated by the VB-XPS data, the ZnO loading is accompanied by a slight narrowing of the band gap of the materials. A combined effect of material modification and surface roughness was taken into consideration to explain the evolution of surface super-hydrophilicity of the materials under UV irradiation. The loading process resulted in increasing surface wettability with approx. 33%, and in a drastic extension of activation decay, which clearly points out to the effect of ZnO-TiO2 heterojunctions.
URI: http://elib.gsu.by/handle/123456789/12444
Appears in Collections:Статьи

Files in This Item:
File Description SizeFormat 
Dobromir_Surface_Wettability.pdf5.97 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.