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Method for preparing conical AAO by alternately carrying out anodic oxidation and phosphoric acid chambering

A technology of anodic oxidation and phosphoric acid, applied in the field of electrochemistry, can solve the problems of unsuitable industrial production, high cost and low efficiency of tapered AAO template preparation

Pending Publication Date: 2021-05-18
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are few reports on the preparation method of conical AAO, and all of them are prepared by physical imprinting. The preparation cost of the conical AAO template obtained in this way is high and the efficiency is low, and it cannot be industrialized.

Method used

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  • Method for preparing conical AAO by alternately carrying out anodic oxidation and phosphoric acid chambering
  • Method for preparing conical AAO by alternately carrying out anodic oxidation and phosphoric acid chambering
  • Method for preparing conical AAO by alternately carrying out anodic oxidation and phosphoric acid chambering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) First cut the 300μm thick high-purity aluminum sheet into a 2cm×2cm square, and then use a tablet press to flatten it, and the pressure is controlled at about 2MPa;

[0049] (2) Ultrasonic cleaning of the aluminum sheet cut in step (1) in absolute ethanol solution for 10 minutes to remove pollutants on the surface of the aluminum sheet, and then ultrasonic cleaning in acetone solution for 10 minutes to remove organic matter on the surface of the aluminum sheet and blow dry with nitrogen;

[0050] (3) annealing the aluminum sheet cleaned in step (2) at 400° C. for 2 hours in a nitrogen atmosphere to release the stress inside the aluminum sheet and reduce defects inside the crystal;

[0051] (4) Encapsulate the aluminum sheet after step (3) annealing, and reserve the anodized area as a circle with a radius of 0.75 cm;

[0052] (5) Place the aluminum sheet packaged in step (4) on the anode, and the carbon rod as the cathode, and perform electrochemical polishing at roo...

Embodiment 2

[0069] (1) First cut the 300μm thick high-purity aluminum sheet into a 2cm×2cm square, and then use a tablet press to flatten it, and the pressure is controlled at about 2MPa;

[0070] (2) Ultrasonic cleaning of the aluminum sheet cut in step (1) in absolute ethanol solution for 10 minutes to remove pollutants on the surface of the aluminum sheet, and then ultrasonic cleaning in acetone solution for 10 minutes to remove organic matter on the surface of the aluminum sheet and blow dry with nitrogen;

[0071] (3) annealing the aluminum sheet cleaned in step (2) at 400° C. for 2 hours in a nitrogen atmosphere to release the stress inside the aluminum sheet and reduce defects inside the crystal;

[0072] (4) Encapsulate the aluminum sheet after step (3) annealing, and reserve the anodized area as a circle with a radius of 0.75 cm;

[0073] (5) Place the aluminum sheet packaged in step (4) on the anode, and the carbon rod as the cathode, and perform electrochemical polishing at roo...

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Abstract

The invention relates to a method for preparing conical AAO by alternately carrying out multiple steps. Firstly, primary anodic oxidation is carried out on a packaged aluminum sheet in a phosphoric acid system, a primary oxidation layer is removed in a chromic acid and phosphoric acid mixed solution, then anodic oxidation is carried out on the aluminum sheet, chambering is carried out in a phosphoric acid solution, and the steps of anodic oxidation and phosphoric acid chambering are repeated. By utilizing the method, a conical AAO template with the surface pore diameter of 375nm, the bottom pore diameter of 100nm and the pore depths of 1.5 [mu]m and 3 [mu]m is prepared. The pore depth, the surface and bottom pore diameters and the pore diameter change smoothness of the conical AAO are adjusted by controlling the oxidation time, the chambering time and the oxidation times. The conical AAO prepared through the method is high in order degree, controllable in parameter, free of physical imprinting and low in preparation cost. The invention not only opens up the field for researching the magnetostatic interaction between magnetic nanowires of an array structure, but also has potential application in the preparation of photoelectric materials by utilizing the conical structure characteristic.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for preparing conical AAO by alternately performing anodic oxidation and phosphoric acid hole expansion. Background technique [0002] Since Keller et al. first reported the preparation of anodic oxide aluminum hole templates by electrochemical methods in 1953, the research on alumina templates has continued for more than half a century. In 1995, researchers Masuda and Fukada used the secondary oxidation method to prepare AAO membranes with highly ordered hole arrays for the first time, and used them as templates to prepare uniform and ordered metal nanohole arrays, which created the AAO membrane in modern nanostructures and New applications in device research. Due to the flexibility and convenience of the preparation process of the AAO film, and the structural characteristics of the AAO film can be controlled by various process parameters in the preparation pr...

Claims

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Application Information

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IPC IPC(8): C25D11/04C25D11/16C25D11/24
CPCC25D11/045C25D11/16C25D11/24
Inventor 郑辉胡东平张阳郑鹏郑梁
Owner HANGZHOU DIANZI UNIV
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