Preparation of hierarchically structured anodic aluminum oxide by a hexagonal embedded nanosphere array

RSC Advances ◽  
2014 ◽  
Vol 4 (85) ◽  
pp. 45147-45150 ◽  
Author(s):  
Ming Cong ◽  
Yuyang Wang ◽  
Xinnan Wang ◽  
Yi Wang ◽  
Shuping Xu ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Anodic Aluminum ◽  
Interpore Distance ◽  
Distance Relation

A hierarchically structured anodic aluminum oxide (AAO) with multilayered channels was achieved. A “defect anodization” mechanism based on a new voltage/interpore distance relation was proposed.

Fabrication of Low Cost Membrane from Anodic Aluminum Oxide

2017 ◽  
Vol 751 ◽  
pp. 363-367
Author(s):  
Peerawith Sumtong ◽  
Apiluck Eiad-Ua
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Average Pore Diameter ◽  
Process Conditions ◽  
Low Grade ◽  
Pore Density ◽  
Average Pore ◽  
Anodic Aluminum ◽  
Interpore Distance

Anodic Aluminum Oxide (AAO) membrane has been successfully fabricated from two-step anodization with aluminum low grade (Al6061). The pore density, the pore diameter, and the interpore distance can be controlled by varying anodization process conditions. However, there are limits to control the mechanical strength and growth of AAO arrays, such as pore density, pore diameter and interpore distance. In this research the self-organized two-step anodization is carried out varying time at 24, 48 and 72 hours, respectively with 40V at the low temperature 2-5°C. The optimum conditions of AAO with two-step anodization is 40V for 48 hr. Finally, AAO substrate is separated from aluminum low-grade and enlarged pore diameter with pore widening process by 5% H3PO4. The physical properties were investigated by mean of field emission scanning electron microscope (FE-SEM) show that the average pore diameter and average interpore distance increase with the anodization time. Al6061 Aluminum substrate can be used to fabricate a nanoporous AAO film with an average pore diameter and average interpore distance larger than 70 and 90 nanometers, respectively but less mechanical stability.

scholarly journals Innovative Nanoimprint-Assisted Fabrication of Anodic Aluminum Oxide

2017 ◽  
Vol 1 (1) ◽  
pp. 24-29
Author(s):  
Po-Chun Chen ◽  
Youwei Jiang ◽  
Dawen Li ◽  
Jun Zou ◽  
Xing Cheng
Keyword(s):  
Aspect Ratio ◽  
Aluminum Oxide ◽  
High Aspect Ratio ◽  
Anodic Aluminum Oxide ◽  
Pore Sizes ◽  
Anodic Aluminum ◽  
Interpore Distance ◽  
Nanoporous Structures

Anodic aluminum oxide (AAO) templates possess highly-ordered nanoporous structures, with advantages such as high aspect ratio. However, there are limits to control the growth of the traditional AAO arrays, such as interpore distance, pore sizes and densities. In this study, we introduce an innovative nanoimprint process guided AAO fabrication to overcome these limitations of the traditional AAO arrays.

The influence of thickness, interpore distance and compositional structure on the optical properties of self-ordered anodic aluminum oxide films

2016 ◽  
Vol 4 (32) ◽  
pp. 7658-7666 ◽  
Author(s):  
C. V. Manzano ◽  
J. P. Best ◽  
J. J. Schwiedrzik ◽  
A. Cantarero ◽  
J. Michler ◽  
...  
Keyword(s):  
Optical Properties ◽  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Oxide Films ◽  
Pore Density ◽  
Anodic Aluminum ◽  
Compositional Structure ◽  
Interpore Distance

The reflectance was found to depend on the thickness of the AAO films and significantly on the inter-pore distance (pore density). The chemistry of the system plays an important role regarding the optical properties.

Improved Pore Array and Uniformity of Anodic Aluminum Oxide Template by Using a Rapid Thermal Anneal Process

2006 ◽  
Vol 118 ◽  
pp. 535-540
Author(s):  
Dong Gun Lim ◽  
Dong Hee Kim ◽  
Jin Kwang Kim ◽  
Odae Kwon ◽  
Kea Joon Yang ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Vacuum State ◽  
Anodic Aluminum Oxide Template ◽  
Process Time ◽  
Vacuum Furnace ◽  
Rapid Thermal Anneal ◽  
Anodic Aluminum ◽  
Interpore Distance ◽  
Potential Applications

Ordered nanostructure materials have received attention due to their unique physical properties and potential applications in electronics, mechanics and optical devices. To actualize most of the proposed applications, it is quite important to obtain highly ordered nanostructure arrays. The well-aligned nanostructure can be achieved by synthesizing nanostructure material in the highly ordered template. In this paper, Anodic Aluminum Oxide (AAO) templates were fabricated using a two-step anodization process with pretreatment such as electropolishing and annealing. To reduce process time and get well-aligned pore array, rapid thermal anneal by an IR lamp was employed in vacuum state at 500oC for 2 hours. The pore array is comparable to a template annealed in vacuum furnace at 500oC for 30 hours. The well-fabricated AAO template has a mean pore diameter of 70 nm and the interpore distance of 100nm. The pore density can be as high as 1.2×1010cm-2.

scholarly journals Fabrication and geometric characterization of highly-ordered hexagonally arranged arrays of nanoporous anodic alumina

2014 ◽  
Vol 16 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Wojciech J. Stępniowski ◽  
Agata Nowak-Stępniowska ◽  
Marta Michalska-Domańska ◽  
Małgorzata Norek ◽  
Tomasz Czujko ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Theoretical Calculations ◽  
Anodization Voltage ◽  
Voltage Range ◽  
Nanoporous Anodic Alumina ◽  
Anodic Aluminum ◽  
Interpore Distance

Abstract Anodic aluminum oxide (AAO) has been fabricated in the 0.3 M oxalic acid at voltage range 20-60 V and temperature range of 35-50oC. The resulting nanoporous alumina surfaces were characterized by high resolution scanning electron microscopy, and the images were quantitatively analysed by means of an innovative approach based on fast Fourier transform. The influence of operating anodization voltage and electrolyte temperature on nanopores geometry (pore diameter, interpore distance, porosity, pores density) and arrangement has been studied in details and compared to literature data and theoretical calculations. It was found that independently from the temperature, the best arrangement of the nanopores is for anodic aluminum oxide formed at voltages ranging from 40 to 50 V. Moreover, it was found that pore diameter and interpore distance increase linearly with voltage, what is in line with the literature data.

scholarly journals Fabrication and characterization of highly ordered nanotubes of anodic aluminum oxide

2021 ◽  
pp. 9-13
Keyword(s):  
Aluminum Oxide ◽  
Anodic Aluminum Oxide ◽  
Pore Diameter ◽  
Nanometer Scale ◽  
Force Microscopy ◽  
Anodic Aluminum ◽  
Interpore Distance ◽  
Adhesion Sites ◽  
Atomic Force

Investigated the electrochemical synthesis and characterized of a nanometer scale porous anodic aluminum oxide (AAO) membrane with a mean pore diameter about of 80-100 nm. The anodizing process done by varying the anodizing temperature from 20 °C to 25 °C. The membranes exhibit interesting properties such as controllable pore diameters, periodicity and density distribution. These properties can preselect by adjusting the controlling parameters of a temperature-controlled two-step anodization process. The surface features of the nanometer scale membrane such as pore density, pore diameter and interpore distance were quantified using scanning electron microscopy (SEM) and atomic force microscopy (AFM). SEM and AFM investigations revealed the presence of focal adhesion sites over the surface of the porous membranes. The positive outcomes of the study, indicates that AAO membranes can used for applications in the future.

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