Recent trends in synthesis of nanoporous anodic aluminum oxides

Brzózka, Agnieszka; Brudzisz, Anna; Rajska, Dominika; Bogusz, J; Palowska, Renata; Wójcikiewicz, Dominik; Sulka, Grzegorz D.

doi:10.1016/b978-0-12-816706-9.00002-9

Cited by 5 publications

(4 citation statements)

References 185 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Given that viscosity is a critical element affecting ion mobility and consequently current density, it is altered by adding varying amounts of glycerol to produce different oxide layer thickness, pore diameter, and 6 interpore distance. Similarly, the higher the polyethylene glycol (PEG) content, the higher the electrolyte's relative viscosity as it produces lower pore width and thickness of anodic aluminium oxide [31]. As a result, variations in the electrolyte's viscosity are assumed to be a factor affecting ion migration, or perhaps the ionic current through the barrier layer.…”

Section: Effect Of Electrolyte Compositionmentioning

confidence: 99%

Properties and Application of Electrochemically Anodized Ta2O5 Nanostructures: A Review

Abdul Rani

2022

JMechE

View full text Add to dashboard Cite

Anodization is one of the simplest synthesis methods that can be employed to generate generous nanostructures metal oxide. Knowing the potential of anodized Tantalum Pentoxide (Ta2O5) to form the desired nanostructure which is capable to produce outstanding performance, the elements and factors influence properties enhancement were gathered. The effect of parameter variation during anodization such as electrolyte composition, voltage variation, and anodization duration was evaluated to inspect the nanostructure formed. The results generated the differences in properties of nanostructures. Characterization methods such as field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Transmission electron microscopy (TEM), Atomic force microscopy (AFM), and X-ray electron spectroscopy (XPS) were used to investigate the structural, electrical, chemical, optical, biological and mechanical properties of anodized Ta2O5. The findings show that anodized Ta2O5 is reliable to be employed as gas sensor, photocatalysis, pH sensor, biomedical materials and humidity sensor due to its superior properties to produce high sensitivity device and increase the efficiency. In this review, a general overview of anodized Ta2O5 is presented which focuses on its fundamental properties, method of synthesis anodized Ta2O5, anodizationparameter optimization, and recent applications in chemical and biological area, along with a discussion on future research directions relevant to this material. It is hoped that by synthesising nanostructures via anodization, the sensing performance will improve and Ta2O5 will be proven as a trustworthy metal oxide material for sensing applications.

show abstract

Section: Effect Of Electrolyte Compositionmentioning

confidence: 99%

Properties and Application of Electrochemically Anodized Ta2O5 Nanostructures: A Review

Abdul Rani

2022

JMechE

View full text Add to dashboard Cite

show abstract

“…A non-porous oxide is formed in neutral electrolytes [53]. Conversely, the porous anodic aluminum oxide is formed in acidic electrolytes, such as selenic, sulfuric, oxalic, phosphoric, chromic, malonic, tartaric, citric, malic acid, etc., in which the formed anodic oxide is slightly soluble [54].…”

Section: Incorporation Of Electrolyte Anions Into Anodic Aluminum Oxidesmentioning

confidence: 99%

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

2021

View full text Add to dashboard Cite

Anodic oxidation of metals leads to the formation of ordered nanoporous or nanotubular oxide layers that contribute to numerous existing and emerging applications. However, there are still numerous fundamental aspects of anodizing that have to be well understood and require deeper understanding. Anodization of metals is accompanied by the inevitable phenomenon of anion incorporation, which is discussed in detail in this review. Additionally, the influence of anion incorporation into anodic alumina and its impact on various properties is elaborated. The literature reports on the impact of the incorporated electrolyte anions on photoluminescence, galvanoluminescence and refractive index of anodic alumina are analyzed. Additionally, the influence of the type and amount of the incorporated anions on the chemical properties of anodic alumina, based on the literature data, was also shown to be important. The role of fluoride anions in d-electronic metal anodizing is shown to be important in the formation of nanostructured morphology. Additionally, the impact of incorporated anionic species, such as ruthenites, and their influence on anodic oxides formation, such as titania, reveals how the phenomenon of anion incorporation can be beneficial.

show abstract

“…The ratio of simultaneously occurring self-organized processes of metal oxidation with the formation of oxide and dissolution plays an important role in the formation of porous and tubular anodic oxides of valve metals. Different kinds of metal dissolution during anodic oxidation of aluminum and other valve metals lead to the formation of oxide films with different morphologies: barrier layers, quasi-regular porous layers, high degree self-ordering porous layers as well as tubular and nanocomposite structures [ 6 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. The anodizing electrolyte is, aside from other process parameters, the main factor that determines this morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Along with these traditional applications, the cellular-porous structure of PAOF provides ample opportunities for controlled variation of its morphological parameters, making it possible to create a wide range of functional materials [ 7 , 26 , 41 , 42 , 43 , 44 ]. For this, unconventional electrolytes are being actively investigated [ 31 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ]. The second approach (described in the previous paragraph) is traditionally used to form the PAOF.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

Recent trends in synthesis of nanoporous anodic aluminum oxides

Cited by 5 publications

References 185 publications

Properties and Application of Electrochemically Anodized Ta2O5 Nanostructures: A Review

Properties and Application of Electrochemically Anodized Ta2O5 Nanostructures: A Review

Incorporation of Ions into Nanostructured Anodic Oxides—Mechanism and Functionalities

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

Contact Info

Product

Resources

About