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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" }