Author, as appears in the article.: Kamnev K; Bendova M; Pytlicek Z; Prasek J; Kejík L; Güell F; Llobet E; Mozalev A
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Llobet Valero, Eduard
Keywords: Transition metal oxides Sers Selenic acid Porous anodic alumina Anodizing Al o –nb o nanocomposite 2 3 2 5
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 (Se2−) 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.
Thematic Areas: Surfaces, coatings and films Química Process chemistry and technology Odontología Medicina ii Medicina i Materials science, ceramics Materials chemistry Materiais Interdisciplinar Geociências Farmacia Ensino Engenharias iv Engenharias iii Engenharias ii Engenharias i Electronic, optical and magnetic materials Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ceramics and composites Biotecnología Astronomia / física Arquitetura, urbanismo e design Arquitetura e urbanismo
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: eduard.llobet@urv.cat
Author identifier: 0000-0001-6164-4342
Record's date: 2024-01-15
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://www.sciencedirect.com/science/article/pii/S0272884223023878
Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Ceramics International. 49 (22): 34712-34725
APA: Kamnev K; Bendova M; Pytlicek Z; Prasek J; Kejík L; Güell F; Llobet E; Mozalev A (2023). Se-doped Nb2O5–Al2O3 composite-ceramic nanoarrays via the anodizing of Al/Nb bilayer in selenic acid. Ceramics International, 49(22), 34712-34725. DOI: 10.1016/j.ceramint.2023.08.134
Article's DOI: 10.1016/j.ceramint.2023.08.134
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications
Repositori URV