Anodization of FeAl intermetallic alloys for bandgap tunable nanoporous mixed aluminum-iron oxide
PBN-AR
Instytucja
Instytut Optoelektroniki (Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego)
Źródłowe zdarzenia ewaluacyjne
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
ISSN
1572-6657
EISSN
Wydawca
ELSEVIER SCIENCE SA
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
37-44
Numer tomu
771
Link do pełnego tekstu
Identyfikator DOI
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Słowa kluczowe
en
Anodization
Self-organization
Nanopores
Intermetallics
Oxides
Streszczenia
Język
en
Treść
Using a two-step self-organizing anodization of FeAl intermetallic alloy in sulfuric acid, a mixed nanoporous anodic aluminum-iron oxide composite with a voltage-controlled morphology and bandgap was obtained. The chemical composition of nanoporous oxide composites formed with Al, Fe and 0 elements was determined by X-ray photoelectron spectroscopy. It was demonstrated that bandgap of the resulting anodic oxide composites can be tuned from 3.65 eV (samples prepared at 5 V) to 2.06 eV (samples prepared at 17.5 V), which was attributed to the increase in the composition ratio of the oxyhydroxide MOOH (where M = Al and Fe). Thus, water is more involved in the formation of oxide MOOH. After annealing at 600 degrees C, X-ray diffraction confirmed formation of a spinet phase of FeAl2O4. FE-SEM observations of the formed oxide demonstrated that ultra-small nanopores with a diameter of 12.8 +/- 3.0 nm were formed at 5 V. The pore diameter and interpore distance were found to be linearly dependent on the voltage; however, slopes of the fitted curves were much larger than that of nanoporous anodic oxide formed on aluminum. Large current densities recorded during anodization allowed for formation of nanoporous anodic oxide with a growth rate of up to 743.0 +/- 17.9 mu m/h (20 V). (C) 2016 Elsevier B.V. All rights reserved.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
737780
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