Dielectric properties of nanostructured mixed-oxide films formed by anodizing Al/Zr bilayers

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F21%3APU142242" target="_blank" >RIV/00216305:26620/21:PU142242 - isvavai.cz</a>

Result on the web

<a href="https://www.confer.cz/nanocon/2020/3693-dielectric-properties-of-nanostructured-mixed-oxide-films-formed-by-anodizing-al-zr-bilayers" target="_blank" >https://www.confer.cz/nanocon/2020/3693-dielectric-properties-of-nanostructured-mixed-oxide-films-formed-by-anodizing-al-zr-bilayers</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.37904/nanocon.2020.3693" target="_blank" >10.37904/nanocon.2020.3693</a>

Result language

angličtina

Original language name

Dielectric properties of nanostructured mixed-oxide films formed by anodizing Al/Zr bilayers

Original language description

ZrO2 is a ceramic material suitable for high-temperature coatings, fuel cells as a solid proton-conducting electrolyte, and metal-oxide-semiconductor devices due to its recently explored promising dielectric properties. In this work, anodic nanostructured ZrO2-Al2O3 mixed films were synthesized on substrates via anodizing/reanodizing of a thin Zr layer through a porous anodic alumina (PAA) film at 40/240 V in 0.6 M (COOH)(2) and characterized by scanning electron microscopy and electrochemical impedance spectroscopy (EIS) including the measurements under various bias potentials. The films are composed of ZrO2 nanofingers penetrating the alumina pores, partially mixing with Al2O3. Nanofingers are anchored to a ZrO2 bottom-oxide nanofilm that forms under the PAA during anodization. The EIS reveals a nearly ideal dielectric behavior of the ZrO2-Al2O3 mixed-oxide nanostructured films. After dissolution of the PAA layer, the dielectric properties of the remaining zirconium oxide film become slightly worse, due to the specific structure and deviation from perfect stoichiometry. The ZrO2-Al2O3 mixed-oxide nanostructured film permittivity is calculated to be 11, which is higher than that of alumina (9.8) due to the contribution of ZrO2 nanofingers grown in the alumina nanopores. After the PAA dissolution, the film permittivity increases substantially, up to 46, which is twice the permittivity of ZrO2 (22) grown anodically on zirconium metal in a classical way. The ZrO2-Al2O3 mixed-oxide nanostructured films prepared via the PAA-assisted anodization are of high interest for potential application to various types of capacitors due to their near-ideal dielectric properties. The unique dielectric behavior of the PAA-dissolved ZrO2 film deserves detailed investigation in a future work.

Czech name

—

Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

21001 - Nano-materials (production and properties)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2021

Confidentiality

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

Article name in the collection

Proceedings 12th International Conference on Nanomaterials - Research & Application

ISBN

978-80-87294-98-7

ISSN

—

e-ISSN

—

Number of pages

6

Pages from-to

44-49

Publisher name

TANGER LTD

Place of publication

SLEZSKA

Event location

Brno, Hotel Voroněž

Event date

Oct 21, 2020

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000664505500007