Digitální knihovnaUPCE
 

Atomic Layer Deposition Al2O3 coatings significantly improve thermal, chemical and mechanical stability of anodic TiO2 nanotube layers

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Abstrakt

We report on a very significant enhancement of the thermal, chemical, and mechanical stability of self-organized TiO2 nanotubes layers, provided by thin Al2O3 coatings of different thicknesses prepared by atomic layer deposition (ALD). TiO2 nanotube layers coated with Al2O3 coatings 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 Al2O3 coatings guarantee unprecedented chemical stability of TiO2 nanotube layers in harsh environments of concentrated H3PO4 solutions.

Rozsah stran

p. 3208-3216

ISSN

1520-5827
0743-7463

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Projekt

EC/H2020/638857/EU/Towards New Generation of Solid-State Photovoltaic Cell: Harvesting Nanotubular Titania and Hybrid Chromophores/CHROMTISOL

Zdrojový dokument

Langmuir. 2017, vol. 33, issue 13

Vydavatelská verze

http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.7b00187

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Klíčová slova

TiO2, nanotubes, Al2O3 coating, ALD, stability

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Except where otherwised noted, this item's license is described as Attribution-NonCommercial-NoDerivs 4.0