Effects of Anodizing Voltages on the Pore Morphology Formation of Porous Anodic Aluminas and Corresponding Current Density Variations

Bu, Sang Don; Choi, Yusong; Hyeon, Jeong; Bae, Tae Sung

doi:10.3938/jkps.55.835

Cited by 22 publications

(3 citation statements)

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“…The obtained PAAO layer structure ( Figure 1a ) with a hexagonal pore arrangement, ≈100 nm center-to-center distance, and ≈30 nm pore diameter corresponded well to the expected results of using anodization in 0.3 M oxalic acid electrolyte and 40 V voltage [ 24 – 25 ]. PAAO is not a homogeneous material; instead, it consists of a porous layer and the barrier layer on top of the Al substrate ( Figure 1b ).…”

Section: Resultssupporting

confidence: 80%

In situ optical sub-wavelength thickness control of porous anodic aluminum oxide

Dutovs,

Popļausks,

Putāns

et al. 2024

Beilstein J. Nanotechnol.

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Porous anodic aluminum oxide (PAAO), sometimes referred to as nanoporous anodic alumina, serves as a cost-effective template for nanofabrication in many fields of science and engineering. However, production of ultrathin PAAO membranes with precise thickness in the optical sub-wavelength range remains challenging because of difficulties regarding process control at the initial stage of anodic oxidation. In this study, we demonstrate a technique for consistently manufacturing PAAO with the targeted thickness. An electrochemical cell with an optical window was designed for reflectance spectroscopy of PAAO during anodization. Real-time fitting of spectra to a transfer-matrix model enabled continuous monitoring of the thickness growth of the PAAO layer. Automation software was designed to terminate the anodization process at preset PAAO thickness values. While the concept was illustrated using the widely used method of anodization in a 0.3 M oxalic acid electrolyte with a 40 V potential, it can be readily customized for other protocols. PAAO layers with effective thickness below 300 nm could be produced with a few nanometers accuracy using single-crystal aluminum substrates. The results were confirmed using spectroscopic ellipsometry. The method for controlling the thickness during anodization eliminates the necessity of sample sectioning for electron microscopy and is particularly valuable for the small-scale production of PAAO-based functional optical coatings.

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Section: Resultssupporting

confidence: 80%

In situ optical sub-wavelength thickness control of porous anodic aluminum oxide

Dutovs,

Popļausks,

Putāns

et al. 2024

Beilstein J. Nanotechnol.

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“…High-purity (99.999%) aluminum sheet (GoodFellow) with a thickness of 0.25 mm, cut in 9 × 18 mm 2 pieces, was used as the starting material for sample fabrication. After degreasing in acetone and isopropyl alcohol, the aluminum surface was electropolished for 3 min at room temperature in a mixture of 60% HClO 4 and C 2 H 5 OH (volumetric ratio 1:4) under applied voltage 10–15 V. 25…”

Section: Methodsmentioning

confidence: 99%

“…The first anodization was done using well-known two-step protocols 25 either using 0.3 M H 2 SO 4 at 20 V anodizing potential for 1 h or 0.3 M C 2 H 2 O 4 electrolyte with a 40 V anodizing voltage for 1 h. This was done at room temperature using aluminum anode and platinum cathode two-electrode cell. The oxide layer after first anodization stage was removed by a solution of H 3 PO 4 /CrO 3 (11:4%) at 70 °C for 2 h.…”

Section: Methodsmentioning

confidence: 99%

Variable Thickness Porous Anodic Alumina/Metal Film Bilayers for Optimization of Plasmonic Scattering by Nanoholes on Mirror

Popļausks¹,

Jevdokimovs²,

Malinovskis³

et al. 2018

ACS Omega

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Continuously variable thickness porous anodic aluminum oxide (PAAO) films were obtained using electrochemical oxidation of bulk aluminum sheet while both electrodes were simultaneously withdrawn from the electrolyte solution. The thickness gradient was controlled by the withdrawal rate (1–10 mm/min range) and thickness variation demonstrated from below 50 nm to above 1 micrometer. The thickness increased linearly with the sample lateral coordinate, whereas the nanopore structure (diameter and interpore distance) remained unchanged. Effects of the initial pore growth and capillary forces are discussed. The presented method can be used for tuning optimal PAAO thickness for optical and other applications as exemplified by finding maximum plasmonic scattering in structured Al–PAAO–Au multilayers. Enhanced scattering from porous gold film separated by a specific-thickness PAAO layer from aluminum mirror surface is demonstrated.

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The effect of anodizing voltage on morphology and photocatalytic activity of tantalum oxide nanostructure

Momeni

Mirhosseini

Chavoshi

et al. 2015

J Mater Sci: Mater Electron

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Effects of Anodizing Voltages on the Pore Morphology Formation of Porous Anodic Aluminas and Corresponding Current Density Variations

Cited by 22 publications

References 0 publications

In situ optical sub-wavelength thickness control of porous anodic aluminum oxide

In situ optical sub-wavelength thickness control of porous anodic aluminum oxide

Variable Thickness Porous Anodic Alumina/Metal Film Bilayers for Optimization of Plasmonic Scattering by Nanoholes on Mirror

The effect of anodizing voltage on morphology and photocatalytic activity of tantalum oxide nanostructure

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