XPS characterization of niobium-oxide nanocolumn arrays via self-organized anodizing in selenic acid

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F23%3APU150159" target="_blank" >RIV/00216305:26620/23:PU150159 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.confer.cz/nanocon/2022/4574-xps-characterization-of-niobium-oxide-nanocolumn-arrays-via-self-organized-anodizing-in-selenic-acid" target="_blank" >https://www.confer.cz/nanocon/2022/4574-xps-characterization-of-niobium-oxide-nanocolumn-arrays-via-self-organized-anodizing-in-selenic-acid</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/nanocon.2022.4574" target="_blank" >10.37904/nanocon.2022.4574</a>

Jazyk výsledku

angličtina

Název v původním jazyce

XPS characterization of niobium-oxide nanocolumn arrays via self-organized anodizing in selenic acid

Popis výsledku v původním jazyce

As previously reported, arrays of Nb2O5 nanocolumns on substrates may be synthesized by anodizing Al-on-Nb bilayers in oxalic, sulfuric, malonic, or phosphoric acids. Here, for the first time, we employed a new anodizing electrolyte – selenic acid (H2SeO4) due to a unique morphology of porous anodic alumina (PAA) formed in this electrolyte featuring extremely narrow pores and therefore, the minimal possible porosity (~3%) among the PAA films prepared in the usual solutions. Such a morphology may result in distinctive structural, physical, and chemical properties of the niobium-oxide nanoarrays complemented by the specific dielectric, optical, electro-optical, catalytic, and antibacterial properties in case the selenium species are incorporated into the column structure during the anodizing. The columns were prepared from the magnetron-sputtered Al/Nb bilayers by anodizing at 12 or 40 V, followed by re-anodizing to 80 or 120 V, respectively, and selective dissolution of the alumina overlayer. Detailed XPS characterization confirmed that selenium species is present in the column material. The fitting of the narrow-scan Se 3d spectra, complicated by overlapping with Nb 4s peaks, shows that selenium is incorporated in the form of selenate (SeO42−) and selenide (Se2−) anions, likely creating a core-shell structure. Quantitative analysis reveals that about 1.5–3.0% of O2− anions in the oxide structure are replaced by selenate or selenide anions. Further investigation is in progress to understand the formation-structure-morphology relationship and explore the functional properties of the arrays.

Název v anglickém jazyce

XPS characterization of niobium-oxide nanocolumn arrays via self-organized anodizing in selenic acid

Popis výsledku anglicky

As previously reported, arrays of Nb2O5 nanocolumns on substrates may be synthesized by anodizing Al-on-Nb bilayers in oxalic, sulfuric, malonic, or phosphoric acids. Here, for the first time, we employed a new anodizing electrolyte – selenic acid (H2SeO4) due to a unique morphology of porous anodic alumina (PAA) formed in this electrolyte featuring extremely narrow pores and therefore, the minimal possible porosity (~3%) among the PAA films prepared in the usual solutions. Such a morphology may result in distinctive structural, physical, and chemical properties of the niobium-oxide nanoarrays complemented by the specific dielectric, optical, electro-optical, catalytic, and antibacterial properties in case the selenium species are incorporated into the column structure during the anodizing. The columns were prepared from the magnetron-sputtered Al/Nb bilayers by anodizing at 12 or 40 V, followed by re-anodizing to 80 or 120 V, respectively, and selective dissolution of the alumina overlayer. Detailed XPS characterization confirmed that selenium species is present in the column material. The fitting of the narrow-scan Se 3d spectra, complicated by overlapping with Nb 4s peaks, shows that selenium is incorporated in the form of selenate (SeO42−) and selenide (Se2−) anions, likely creating a core-shell structure. Quantitative analysis reveals that about 1.5–3.0% of O2− anions in the oxide structure are replaced by selenate or selenide anions. Further investigation is in progress to understand the formation-structure-morphology relationship and explore the functional properties of the arrays.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

21001 - Nano-materials (production and properties)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings 14th International Conference on Nanomaterials - Research & Application

ISBN

978-80-88365-09-9

ISSN

—

e-ISSN

—

Počet stran výsledku

6

Strana od-do

15-20

Název nakladatele

TANGER Ltd.

Místo vydání

Ostrava, Czech Republic

Místo konání akce

Brno

Datum konání akce

19. 10. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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