Influence of TiO2-Coating Layer on Nanoporous Alumina Membranes by ALD Technique

Geometrical, chemical, optical and ionic transport changes associated with ALD of TiO2-coating on the porous structure of two nanoporous alumina membranes (NPAMs), which were obtained by the two-step aluminum anodization method but with different pore size and porosity, are presented. Chemical and m...

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Bibliographic Details
Published in:Coatings (Basel) 2018-02, Vol.8 (2), p.60
Main Authors: Gelde, Lourdes, Cuevas, Ana, Martínez de Yuso, María, Benavente, Juana, Vega, Víctor, González, Ana, Prida, Víctor, Hernando, Blanca
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Change detection
Coating
Diffusion effects
Electrolytes
Electropositivity
Ion diffusion
Membranes
Morphology
Parameters
Pore size
Porosity
Refractivity
Spectroellipsometry
Spectrum analysis
Thickness
Titanium dioxide
Titanium oxides
Transmission electron microscopy
X ray photoelectron spectroscopy
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Summary:Geometrical, chemical, optical and ionic transport changes associated with ALD of TiO2-coating on the porous structure of two nanoporous alumina membranes (NPAMs), which were obtained by the two-step aluminum anodization method but with different pore size and porosity, are presented. Chemical and morphological changes were determined by analyzing XPS spectra and SEM images, showing practically total coverage of the NPAMs surface and leading to a reduction in the geometrical parameters of both samples, while SAED and high resolution TEM measurements allowed us to determine the crystalline structure and thickness of the TiO2-coating, with the latter confirmed by depth-profile XPS analysis. Spectroscopic ellipsometry measurements were also carried out in order to detect changes in characteristic optical parameters (refractive index, n, and extinction coefficient, k), due to the TiO2-coating of NPAMs. Considering the common application of NPAMs in solute/ion diffusion processes, the effect of the TiO2-coverage on electrochemical parameters was analyzed by measuring the concentration potential with a typical model electrolyte (KCl solutions), leading to an increase of the electropositive character for both kinds of samples.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings8020060