Publication detail

Se-doped Nb2O5-Al2O3 composite-ceramic nanoarrays via the anodizing of Al/Nb bilayer in selenic acid

KAMNEV, K. BENDOVÁ, M. PYTLÍČEK, Z. PRÁŠEK, J. KEJÍK, L. GUELL, F. LLOBET, E. MOZALEV, A.

Original Title

Se-doped Nb2O5-Al2O3 composite-ceramic nanoarrays via the anodizing of Al/Nb bilayer in selenic acid

Type

journal article in Web of Science

Language

English

Original Abstract

Novel arrays of Nb2O5-based ceramic nanostructures of various sizes (9-210 nm) and morphologies (dots, goblets, rods) aligned on substrates are fabricated via the anodizing of a thin Nb film through the initially formed porous anodic alumina (PAA) film in 1.5 M selenic acid (H2SeO4) - a new aqueous electrolyte generating extraordinarily thinner PAA pores than any other solutions. Accordingly, the nanostructures formed in the selenic acid are 1.3-fold thinner and better self-ordered than their counterparts formed from the same Al/Nb precursor bilayer in a reference oxalic-acid electrolyte. The nanostructures have a dual (core/shell) composition: the inner material (the core) is stoichiometric Nb2O5, whereas the outer layer (the shell) is a few nm-thick substoichiometric NbOx mixed with Al2O3. The composite-ceramic nanoarrays grow doped with selenium species such as selenate (SeO42-) and selenide (Se-2(-)) anions originating from the electrolyte and migrating inward under the high electric field. The incorporated Se species do not contribute to photoluminescence emission nor hinder the Raman signal from the nanoarrays, which makes them highly promising as Nb2O5-based SERS biosensing substrates. The planar PAA-inbuilt Se-doped Nb2O5-Al2O3 nanostructured ceramic film performs like a high-k low-loss low-leakage-current dielectric promising for on-chip integration. More potential applications of the Se-doped ceramic nanoarrays developed here include biomedical antibacterial coatings, advanced superhydrophobic surfaces, gas-sensing, and catalytic layers.

Keywords

Al2O3-Nb2O5 nanocomposite; Anodizing; Selenic acid; Transition metal oxides; Porous anodic alumina; SERS

Authors

KAMNEV, K.; BENDOVÁ, M.; PYTLÍČEK, Z.; PRÁŠEK, J.; KEJÍK, L.; GUELL, F.; LLOBET, E.; MOZALEV, A.

Released

15. 11. 2023

Publisher

Elsevier

Location

OXFORD

ISBN

0272-8842

Periodical

Ceramics International

Year of study

49

Number

22, Part A

State

United Kingdom of Great Britain and Northern Ireland

Pages from

34712

Pages to

34725

Pages count

14

URL

https://www.sciencedirect.com/science/article/pii/S0272884223023878

Full text in the Digital Library

http://hdl.handle.net/11012/244316

BibTex

@article{BUT185750,
  author="Kirill {Kamnev} and Mária {Bendová} and Zdeněk {Pytlíček} and Jan {Prášek} and Lukáš {Kejík} and Frank {Guell} and Eduard {Llobet} and Alexander {Mozalev}",
  title="Se-doped Nb2O5-Al2O3 composite-ceramic nanoarrays via the anodizing of Al/Nb bilayer in selenic acid",
  journal="Ceramics International",
  year="2023",
  volume="49",
  number="22, Part A",
  pages="34712--34725",
  doi="10.1016/j.ceramint.2023.08.134",
  issn="0272-8842",
  url="https://www.sciencedirect.com/science/article/pii/S0272884223023878"
}