Incorporation of copper chelate ions into anodic alumina walls

Stępniowski, Wojciech J.; Norek, Małgorzata; Michalska-Domańska, Marta; Nowak-Stępniowska, Agata; Bombalska, Aneta; Włodarski, Maksymilian; Bojar, Z.

doi:10.1016/j.matlet.2013.05.016

Cited by 26 publications

(13 citation statements)

References 21 publications

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“…Ruckschloss et al established that life time for OH‐related fluorescence is about several nanoseconds. At the same time, the F centers fluorescence decay is usually nonexponential and shorter than 7 ns . Consequently, we can conclude that for as‐anodized and samples treated at temperatures below 1200 °C the band at 420 nm can be attributed to the emission of OH‐related centers and other impurities .…”

Section: Resultsmentioning

confidence: 78%

Structural and Fluorescence Studies of Polycrystalline α‐Al₂O₃ Obtained From Sulfuric Acid Anodic Alumina

Chernyakova

Karpicz

Rutkauskas

et al. 2018

Physica Status Solidi (a)

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In the present study, robust α‐Al2O3 specimens (144 µm thick) are obtained by the heat treatment at 1400 °C of free‐standing sulfuric acid anodic alumina. Scanning electron microscopy analysis show that the as‐anodized anodic alumina films possess well‐ordered porous structure with the pore diameter of about 10.2 nm. After heat treatment at 1400 °C the samples lose their porous structure and certain crystallites with average size of 5–6 µm can be observed. These crystallites can be visualized by fluorescence imaging. According to differential scanning calorimetry data accomplished by X‐ray analysis, the first step of crystallization occurs at around 967 °C, producing γ‐Al2O3. The second one takes place at around 1194 °C, which corresponds to the formation of α‐Al2O3. For the as‐anodized and samples treated at temperatures below 1200 °C the band at 420 nm can be attributed to the emission of OH‐related and other impurities centers. The fluorescence at 460 nm relates to emission of oxygen defect centers, such as F and F2 centers, and sharp bands at 678 and 693 nm indicate the formation of highly crystalline alumina. For α‐Al2O3, its fluorescence is caused by both surface defects and oxygen defect centers. The fluorescence spectroscopy can be applied as a cheap, fast, nondestructive method for the identification of amorphous alumina crystallization.

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Section: Resultsmentioning

confidence: 78%

Structural and Fluorescence Studies of Polycrystalline α‐Al₂O₃ Obtained From Sulfuric Acid Anodic Alumina

Chernyakova

Karpicz

Rutkauskas

et al. 2018

Physica Status Solidi (a)

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“…Norek et al in [ 78 ] suggested that the incorporation of soluble C 2 O 4 2− and COO − ions into the oxide framework could lead to enhanced oxide dissolution and preferred cleavages along the cell boundaries [ 79 , 80 , 81 ]. From the point of view of additional possibilities for controlling the PAOF composition, the processes of obtaining PAOF in electrolytes, which contain complex compounds [ 83 , 84 , 85 ], are of great interest.…”

Section: Introductionmentioning

confidence: 99%

Peculiar Porous Aluminum Oxide Films Produced via Electrochemical Anodizing in Malonic Acid Solution with Arsenazo-I Additive

et al. 2021

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The influence of arsenazo-I additive on electrochemical anodizing of pure aluminum foil in malonic acid was studied. Aluminum dissolution increased with increasing arsenazo-I concentration. The addition of arsenazo-I also led to an increase in the volume expansion factor up to 2.3 due to the incorporation of organic compounds and an increased number of hydroxyl groups in the porous aluminum oxide film. At a current density of 15 mA·cm–2 and an arsenazo-I concentration 3.5 g·L–1, the carbon content in the anodic alumina of 49 at. % was achieved. An increase in the current density and concentration of arsenazo-I caused the formation of an arsenic-containing compound with the formula Na1,5Al2(OH)4,5(AsO4)3·7H2O in the porous aluminum oxide film phase. These film modifications cause a higher number of defects and, thus, increase the ionic conductivity, leading to a reduced electric field in galvanostatic anodizing tests. A self-adjusting growth mechanism, which leads to a higher degree of self-ordering in the arsenazo-free electrolyte, is not operative under the same conditions when arsenazo-I is added. Instead, a dielectric breakdown mechanism was observed, which caused the disordered porous aluminum oxide film structure.

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“…Помимо введения в электролит анодирования добавок веществ, содержащих лиганды, способных образовывать растворимые или нерастворимые комплексные соединения с ионами анодируемого вентильного металла, возможен такой подход, когда добавка представляет собой заранее синтезированное устойчивое комплексное соединение, содержащее ион комплексообразователя другой природы, нежели ион анодируемого металла. Известно лишь небольшое количество исследований, посвященных этой теме [39,41,42].…”

Section: Introductionunclassified

“…В работе, посвященной анодированию в присутствии хелатных комплексных соединений меди, было показано, что чем больше скорость роста оксида (большие напряжение и температура), тем больше меди включается в стенки оксида алюминия, что приводит к ухудшению регулярности расположения нанопор. Исследование фотолюминесценции (ФЛ) подтвердило включение хелатных комплексов меди [42].…”

Section: Introductionunclassified

Анодный Оксид Алюминия, Сформированный В Водных Растворах Хелатных Комплексных Соединений Цинка И Кобальта

Позняк¹,

Knörnschild

Pligovka³

et al. 2021

Журнал Технической Физики

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The galvanostatic anodizing results of specially prepared high-purity aluminum in aqueous solutions of complex compounds K3[Co(C2O4)3] and K2[Zn(edta)] of various concentrations in the current density ranges 1.5–1.10·102 and 1.5−30 mA·сm−2, respectively. The kinetic features of anodizing have been established, indicating the occurrence of an oscillatory electrochemical process. Morphological features of a flaky and loose nature for K2[Zn(edta)] and monolithic for K3[Co(C2O4)3], uncharacteristic for anodic aluminum oxide, were revealed. The elemental composition, IR spectroscopic and photoluminescent characteristics of the formed oxides are shown.

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Incorporation of copper chelate ions into anodic alumina walls

Cited by 26 publications

References 21 publications

Structural and Fluorescence Studies of Polycrystalline α‐Al₂O₃ Obtained From Sulfuric Acid Anodic Alumina

Structural and Fluorescence Studies of Polycrystalline α‐Al₂O₃ Obtained From Sulfuric Acid Anodic Alumina

Peculiar Porous Aluminum Oxide Films Produced via Electrochemical Anodizing in Malonic Acid Solution with Arsenazo-I Additive

Анодный Оксид Алюминия, Сформированный В Водных Растворах Хелатных Комплексных Соединений Цинка И Кобальта

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Incorporation of copper chelate ions into anodic alumina walls

Cited by 26 publications

References 21 publications

Structural and Fluorescence Studies of Polycrystalline α‐Al2O3 Obtained From Sulfuric Acid Anodic Alumina

Structural and Fluorescence Studies of Polycrystalline α‐Al2O3 Obtained From Sulfuric Acid Anodic Alumina

Peculiar Porous Aluminum Oxide Films Produced via Electrochemical Anodizing in Malonic Acid Solution with Arsenazo-I Additive

Анодный Оксид Алюминия, Сформированный В Водных Растворах Хелатных Комплексных Соединений Цинка И Кобальта

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Structural and Fluorescence Studies of Polycrystalline α‐Al₂O₃ Obtained From Sulfuric Acid Anodic Alumina

Structural and Fluorescence Studies of Polycrystalline α‐Al₂O₃ Obtained From Sulfuric Acid Anodic Alumina