Method for thinning porous anodized aluminum template barrier layer at normal temperature

A technology of alumina template and porous anode, which is applied in the direction of anodic oxidation, coating, surface reaction electrolytic coating, etc., can solve the problems of restricting popularization, destroying porous structure, and inability to prepare nanomaterials, so as to reduce processing time and improve preparation Efficiency, avoiding the effect of V-shaped channel structure

Inactive Publication Date: 2015-03-25
HUAZHONG UNIV OF SCI & TECH RES INST SHENZHEN
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  • Abstract
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  • Application Information

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Problems solved by technology

The chemical corrosion method mainly uses acid solution to corrode the whole template to thin the barrier layer, but this will corrode the pores or channels at the same time, resulting in larger pore diameters and even destroying the porous structure; the step-down method is mainly used at zero degrees Celsius. The purpose of thinning the barrier layer is achieved by gradually reducing the anodic oxidation voltage, but this method is currently limited to mild

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  • Method for thinning porous anodized aluminum template barrier layer at normal temperature
  • Method for thinning porous anodized aluminum template barrier layer at normal temperature
  • Method for thinning porous anodized aluminum template barrier layer at normal temperature

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Example Embodiment

[0031] Example 1

[0032] S1: Preparation of a porous anodic aluminum oxide primary template including an aluminum layer and an aluminum oxide layer. There are multiple holes in the aluminum oxide layer, the holes penetrate the aluminum oxide layer and form pits on the surface of the aluminum layer, and then remove the aluminum oxide layer on the porous anodized aluminum primary template to obtain a surface with pits Aluminum layer. The detailed process is as follows:

[0033] First cut the aluminum sheet with a thickness of 100μm into regular rectangular pieces of 10mm×100mm, and then anneal them at 500°C in a muffle furnace. The annealing treatment is used to reduce lattice defects and prevent subsequent nanopore irregularities. After annealing treatment The aluminum sheet was ultrasonically cleaned with acetone, alcohol, and distilled water for 15 minutes to remove oil on the surface, and finally with N 2 Blow dry to obtain a clean aluminum sheet.

[0034] Then electrochemical ...

Example Embodiment

[0046] Example 2

[0047] S1: same as step S1 of embodiment 1;

[0048] S2: same as step S2 of embodiment 1;

[0049] S3: The other processes are the same as step S3 of Example 1, except that oxalic acid with a hydrogen ion concentration of 0.2 mol / L is used to thin the barrier layer under the condition of a water bath temperature of 25°C. In the step-down current method, the maximum current is 0.07A, the minimum current is 0, and the gradient of each current decrease is 0.01A. Similarly, a porous anodic aluminum oxide template that can be directly prepared by nanomaterials is obtained.

Example Embodiment

[0050] Example 3

[0051] S1: same as step S1 of embodiment 1;

[0052] S2: same as step S2 of embodiment 1;

[0053] S3: The other process is the same as step S3 of embodiment 1, except that the barrier layer is thinned by using a mixed acid solution of phosphoric acid and citric acid with a hydrogen ion concentration of 0.4 mol / L under the condition of a water bath temperature of 20°C Processing. In the step-down current method, the maximum current is 0.05A, the minimum current is 0, and the gradient of each current decrease is 0.01A. Similarly, a porous anodic aluminum oxide template that can be directly prepared by nanomaterials is obtained.

[0054] In the present invention, the acid solution in step S3 and the hydrogen ion concentration of the acid solution, the water bath temperature in step S3, etc. are not limited to the specific values ​​of the above embodiments, and are not limited to the combination of the above specific values, when the water bath temperature is When t...

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Abstract

The invention discloses a method for thinning a porous anodized aluminum template barrier layer at normal temperature, belonging to the field of porous anodized aluminum templates. The method comprises the following steps: S1, preparing a primary porous anodized aluminum template and removing an aluminum oxide layer on the template to obtain an aluminum layer with pits on the surface; S2, preparing a secondary porous anodized aluminum template containing the aluminum layer and the aluminum oxide layer by taking the aluminum layer obtained in the step S1 as an anode and an inert metal as a cathode; and S3, thinning a barrier layer in the porous anodized aluminum template in the S2 in acid liquor by using a step-down current method to thin the barrier layer at the bottom of a hole to below 10nm, thus realizing thinning treatment, wherein the step-down current method is an electrochemical treatment method which gradually reduces the current from the maximum current to zero with same gradient each time. According to the method disclosed by the invention, the barrier layer can be quickly and efficiently thinned, the shape of the template can be effectively remained, and a broaching phenomenon that the bore diameter is enlarged does not exist.

Description

technical field [0001] The invention belongs to the field of porous anodized aluminum oxide templates, and more specifically relates to a method for thinning the barrier layer of porous anodized aluminum oxide templates at normal temperature. Background technique [0002] Porous alumina has continuous and straight channels, and the depth of the channels can be adjusted according to the length of oxidation time, and because alumina has good chemical and thermal stability, high hardness, and large specific surface area, Therefore, it has become a widely used template for the preparation of nanomaterials, and has extremely important applications in the fields of preparation of nanomaterials, biosensing materials, spectral materials, magnetic materials, and solar cell materials. At present, the porous anodized alumina template is mainly prepared by anodizing aluminum sheets in oxalic acid, sulfuric acid, phosphoric acid and other solutions to prepare a preliminary porous anodize...

Claims

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Application Information

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IPC IPC(8): C25D11/06C25D11/18B82Y40/00
CPCC25D11/045B82Y40/00C25D11/18
Inventor 朱文曹国宝崇保和
Owner HUAZHONG UNIV OF SCI & TECH RES INST SHENZHEN
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