Preparation and AFM characterization of self-ordered porous alumina films on semi-insulated gaas substrate

Highly ordered through-hole anodic porous alumina membranes were fabricated by electrochemical oxidation of aluminum in a controlled two-step process. A teflon dispositive was used to ensure single side anodization. Under the most appropriate condition for the fabrication of ideally ordered anodic aluminum oxide (AAO), the voltage used was 15 V during 24 h in a 15 % w/v sulfuric acid solution. SEM, TEM and FESEM characterization shows that the as-fabricated AAO film has a defect-free array of straight parallel channels perpendicular to the surface. The thickness of the porous membrane is 20 microns, approximately. The ordered channels are formed in a honey comb arrange with a pore diameter in the range 20-30 nm, wall thickness of 10-20 nm, interpore distance of 40 nm, and high aspect ratio of 850. The pore density, quantified by image analysis, is 5.4×1010 pore/cm2; perfect ordering was maintained in the full depth of the membrane. Dimensions of this porous structure provide a convenient way to precision engineer the nanoscale morphology.

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Preparation and Characterization of Porous Alumina Film Using Sol Containing PEG

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.320.159 ◽

2006 ◽

Vol 320 ◽

pp. 159-162 ◽

Cited By ~ 1

Author(s):

Takeshi Miki ◽

Kaori Nishizawa ◽

Kazuyuki Suzuki ◽

Kazumi Kato

Keyword(s):

Porous Alumina ◽

Dip Coating ◽

Poly Ethylene Glycol ◽

Alumina Film ◽

Glass Substrates ◽

Alumina Films ◽

Poly Ethylene ◽

Dip Coating Technique ◽

Hydrolysis Of

To obtain porous alumina films, the precursor sol was prepared by hydrolysis of Al isopropoxide and then mixing with poly(ethylene glycol) (PEG). The porous alumina films were fabricated by dip-coating technique on glass substrates and heating at 500 °C. The film was composed of nano sized particles (30-50 nm). The maximum thickness of the film prepared by one-run dip-coating was ca. 1000 nm. The film had humidity-sensitive electrical resistance at room temperature.

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Preparation of Porous Alumina Template for Nanostructure Fabrication

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.895.21 ◽

2014 ◽

Vol 895 ◽

pp. 21-24

Author(s):

Kuan Ying Kok ◽

Inn Khuan Ng ◽

Nur Ubaidah Saidin ◽

Suhaila Hani Illias

Keyword(s):

Porous Alumina ◽

Formation Rate ◽

Growth Conditions ◽

Nanostructure Fabrication ◽

Alumina Template ◽

One Dimensional ◽

Alumina Films ◽

Porous Alumina Template ◽

Ordered Porous ◽

Anodisation Process

Porous alumina films are widely used as templates for fabricating one-dimensional (1-D) nanostructures such as nanowires or nanotubes. Using a two-step anodisation process, we have successfully optimized the growth conditions for fabricating highly ordered porous alumina films with pore diameters ranging from 20 to 150 nm, to be used as templates for 1-D nanostructure synthesis. The effects of the anodisation conditions on pore structure and the formation rate of the films were systematically studied. It was found that low electrolyte temperatures and agitations decreased the growth rate of the films but favored the process of pore ordering. Removal of oxide layer formed from first anodisation process and removal of barrier oxide at pore ends had an important bearing on pore morphology. Besides the stand-alone porous alumina films, we have also fabricated porous alumina films on rod-shaped Al substrates.

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Fast growth of highly ordered porous alumina films based on closed bipolar electrochemistry

Electrochemistry Communications ◽

10.1016/j.elecom.2020.106822 ◽

2020 ◽

Vol 119 ◽

pp. 106822

Author(s):

Dawei Xu ◽

Xiaojie Feng ◽

Ye Song ◽

Xia Li ◽

Jin Zhang ◽

...

Keyword(s):

Porous Alumina ◽

Fast Growth ◽

Alumina Films ◽

Ordered Porous ◽

Bipolar Electrochemistry

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Preparation and Characterization of Ca-Containing Anodic Alumina

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.41-42.57 ◽

2008 ◽

Vol 41-42 ◽

pp. 57-60

Author(s):

Li Ping He ◽

Zong Zhang Chen ◽

Yiu Wing Mai

Keyword(s):

Porous Alumina ◽

Cell Voltage ◽

Deposition Process ◽

Anodic Alumina ◽

Initial Growth ◽

Anodic Behavior ◽

Deposition Behavior ◽

Electro Deposition ◽

Alumina Films

Ca-containing anodic alumina (CAA) has been successfully prepared by anodizing Al film in an alkali solution at a constant voltage and subsequently electro-depositing calcium salts on and into anodic alumina. This paper investigated the anodic behavior of Al, deposition behavior of calcium salt, and microstructure of CAA. The results show that the anodic behavior of Al in Na3PO4 electrolyte can be described as three continuous stages as of initial growth of the compact barrier layer, formation of porous alumina and further development of its pores and columnar holes. It is also found that cell voltage of electro-deposition process plays an important role at the deposition behavior of calcium slat and the microstructure of Ca-containing anodic alumina (CAA). The higher the cell voltage is, the faster the deposition rate, and the more calcium being deposited at the surface of anodic alumina and into the columnar holes or at the walls of the holes of anodic alumina. It is expected that Ca-containing anodic alumina films are promising substrates for fabricating functional bio-coatings for prosthetic applications.

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