Detail publikace

Porous‐Alumina‐Assisted Growth of Nanostructured Anodic Films on Ti−Nb Alloys

BENDOVÁ, M. KOLÁŘ, J. GISPERT-GUIRADO, F. MOZALEV, A.

Originální název

Porous‐Alumina‐Assisted Growth of Nanostructured Anodic Films on Ti−Nb Alloys

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Porous‐anodic‐alumina (PAA)‐assisted anodizing is employed, for the first time, for growing arrays of oxide nanocolumns on Ti−Nb alloy films with up to 58 at% Nb. Beyond about 24 at% Nb in the alloy, the system allows for high formation potentials of 250–420 V, giving columns that are 500–700 nm long, which are 100 % stable during the PAA etch. The stability worsens when lowering the Nb content in the alloy, owing to contamination of the column roots by alumina, which arises from the amorphous‐to‐crystalline transition of the anodic oxide, oxygen evolution, formation of O2‐filled nanobubbles within the roots, and development of bigger voids. The voids force the roots to regrow and spread laterally along with anodizing the surrounding Al residues, which increases alumina content in the titania‐based nanoroots. The incorporation of sufficient amounts of Nb2O5 in the anodic TiO2 hinders oxide crystallization and lowers alumina content in the roots, which stabilizes the columns. The two oxides are distributed uniformly along the columns, indicating comparable migration rates of Ti4+ and Nb5+ ions in the mixed anodic oxide. This uniform distribution, combined with possibly mixing the oxides at atomic level, is expected to narrow the band gap of the material, which is of vast importance for solar energy conversion applications.

Klíčová slova

Anodizing, nanostructures, porous anodic alumina, Ti@Nb alloys, thin films

Autoři

BENDOVÁ, M.; KOLÁŘ, J.; GISPERT-GUIRADO, F.; MOZALEV, A.

Vydáno

1. 10. 2018

ISSN

2196-0216

Periodikum

ChemElectroChem

Ročník

5

Číslo

19

Stát

Spolková republika Německo

Strany od

2825

Strany do

2835

Strany počet

11

URL

https://onlinelibrary.wiley.com/doi/abs/10.1002/celc.201800785

BibTex

@article{BUT150769,
  author="Mária {Bendová} and Jakub {Kolář} and Francesc {Gispert-Guirado} and Alexander {Mozalev}",
  title="Porous‐Alumina‐Assisted Growth of Nanostructured Anodic Films on Ti−Nb Alloys",
  journal="ChemElectroChem",
  year="2018",
  volume="5",
  number="19",
  pages="2825--2835",
  doi="10.1002/celc.201800785",
  issn="2196-0216",
  url="https://onlinelibrary.wiley.com/doi/abs/10.1002/celc.201800785"
}