The effects of electropolishing on the nanochannel ordering of the porous anodic alumina prepared in oxalic acid

Rauf, Abdur; Mehmood, Mazhar; Rasheed, Muhammad Asim; Aslam, Muhammad

doi:10.1007/s10008-008-0550-2

Cited by 41 publications

(32 citation statements)

References 42 publications

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“…30 After this, the foil was electropolished in a mixture of perchloric acid (HClO 4 ) and ethyl alcohol (C 2 H 5 OH) (volume ratio 1:4) at constant potential of 10 V for 3 min to diminish the roughness of the aluminum surface. 31 The sample was anodized in a 0.3 M oxalic acid solution at 40 V for 1 h, under constant temperature at 10 °C. The other sample was anodized under 0.1 M phosphoric acid solution at 190 V and 1°C.…”

Section: Methodsmentioning

confidence: 99%

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Kim¹,

Lee

2014

Bulletin of the Korean Chemical Society

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Anodic alumina oxide (AAO), a self-ordered hexagonal array, has various applications in nanofabrication such as the fabrication of nanotemplates and other nanostructures. In order to obtain highly ordered porous alumina membranes, a two-step anodization or prepatterning of aluminum are mainly conducted with straight electric field. Electric field is the main driving force for pore growth during anodization. However, impurities in aluminum can disturb the direction of the electric field. To confirm this, we anodized two different aluminum foil samples with high purity (99.999%) and relatively low purity (99.8%), and compared the differences in the surface morphologies of the respective aluminum oxide membranes produced in different electric fields. Branched pores observed in porous alumina surface which was anodized in low-purity aluminum and the size; dimensions of the pores were found to be usually smaller than those obtained from high-purity aluminum. Moreover, anodization at high voltage proceeds to a significant level of conversion because of the high speed of the directional electric field. Consequently, anodic alumina membrane of a specific morphology, i.e., meshed pore, was produced.

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Section: Methodsmentioning

confidence: 99%

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Kim¹,

Lee

2014

Bulletin of the Korean Chemical Society

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“…Depending on the anodizing conditions, the pores can arrange in a well-ordered triangular (hexagonal) geometry with a narrow distribution of pore diameters and inter-pore distances, in addition to achieving straight pores with negligible branching or annihilation [20][21][22][23]. Apart from anodizing conditions, electropolishing pre-treatment of aluminum plays a significant role in determining the quality of ordering, i.e., domain size, and defect density, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Apart from anodizing conditions, electropolishing pre-treatment of aluminum plays a significant role in determining the quality of ordering, i.e., domain size, and defect density, etc. For instance, the quality of pore ordering improves at 50 V (and above) in oxalic acid when the aluminum is electropolished in Brytal solution instead of perchloric acid-alcohol solution, for which the 40 V is best ordering voltage [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of ordering quality of the pores on the photoluminescence of porous anodic alumina prepared in oxalic acid

Rauf

Mehmood

Ahmed

et al. 2010

Journal of Luminescence

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“…Critical high anodising potential, which is the anodising potential required to induce high current density while preventing the local current density concentration on the aluminium surface, was applied to the high-field anodising. The role of electropolishing prior to the anodising process was also emphasised in order to achieve highly ordered PAA [18,19].…”

Section: Introductionmentioning

confidence: 99%

A simple one-step anodising method for the synthesis of ordered porous anodic alumina

Voon

Derman

Hashim

et al. 2012

Journal of Experimental Nanoscience

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Porous anodic alumina (PAA) has been produced on aluminium substrate by single-step anodising at 50 V in 0.3 M oxalic acid at 15 C for 60 min. The highly ordered pore and cell structure was achieved by subjecting the PAA to oxide dissolution treatment in a mixture of chromic and phosphoric acids. The nanostructure prior and post-oxide dissolution treatment was examined under scanning electron microscope. It was found that the oxide dissolution treatment improves the regularity of the cell and pore structure significantly. Uniform closely packed honeycomb structure of PAA is obtained. The uniformities of pore diameter and interpore distance are also enhanced. Compared to the PAA prior treatment, it was noticed that the pore diameter of the post-treatment PAA increases.

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The effects of electropolishing on the nanochannel ordering of the porous anodic alumina prepared in oxalic acid

Cited by 41 publications

References 42 publications

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Effect of Aluminum Purity on the Pore Formation of Porous Anodic Alumina

Effects of ordering quality of the pores on the photoluminescence of porous anodic alumina prepared in oxalic acid

A simple one-step anodising method for the synthesis of ordered porous anodic alumina

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