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Preparation method of porous alumina template

A porous alumina and template technology, applied in the direction of nanotechnology, can solve the problems of low order degree and unstable porous alumina template, and achieve the effect of high order degree and easy control of preparation conditions

Inactive Publication Date: 2015-02-18
WUXI IMPRINT NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is to provide a method for preparing a porous alumina template to solve the problems of instability and low degree of order in the porous alumina template prepared in the prior art

Method used

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Examples

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Embodiment 1

[0021] The aluminum sheet was immersed in a mixed solution of acetone and ethanol for 20 minutes, and after taking it out, it was ultrasonicated in deionized water for 10 minutes, and annealed at 200°C for 3 hours under the protection of nitrogen. Take aluminum sheet as anode and platinum sheet as cathode. In a mixed solution with a volume ratio of perchloric acid and ethanol of 1:4, the voltage is 25V, electrolysis is performed for 1 minute, and the oxide layer on the surface of the device is taken out. Oxidize in an electrolytic cell with an oxalic acid concentration of 0.3 mol / L. The oxidation conditions are: temperature 15°C, voltage 30V, and oxidize for 10 minutes; after the oxidation is completed, the aluminum sheet is taken out and placed in a mixed corrosive solution for immersion treatment. The mass ratio of phosphoric acid, chromic acid, and water in the mixed etching solution is 6:1.8:92.2, and it is soaked for 1 to 2 hours at a temperature of 30-40°C. Then it was pl...

Embodiment 2

[0024] The aluminum sheet was immersed in a mixed solution of acetone and ethanol for 20 minutes, and after taking it out, it was ultrasonicated in deionized water for 10 minutes, and annealed at 200°C for 3 hours under the protection of nitrogen. Take aluminum sheet as anode and platinum sheet as cathode. In a mixed solution with a volume ratio of perchloric acid and ethanol of 1:4, the voltage is 25V, electrolysis is performed for 1 minute, and the oxide layer on the surface of the device is taken out. Oxidation was performed in an electrolytic cell with an oxalic acid concentration of 0.5 mol / L. The oxidation conditions were: temperature 15°C, voltage 30V, and oxidized for 15 minutes; after the oxidation, the aluminum piece was taken out and placed in a mixed corrosive solution for immersion treatment. The mass ratio of phosphoric acid, chromic acid, and water in the mixed etching solution is 6:1.8:92.2, and it is soaked for 1 to 2 hours at a temperature of 30-40°C. Then it ...

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Abstract

The invention discloses a preparation method of a porous alumina template and belongs to the technical field of nanoimprint. The preparation method comprises the following operation steps: (1) performing ultrasonic cleaning on the surface of an aluminum sheet; (2) annealing under the condition of a high temperature to eliminate the internal stress of the aluminum sheet; (3) performing electrochemical polishing in the mixed solution of perchloric acid and ethanol; (4) performing primary anodic oxidation in an oxalic acid solution; (5) performing secondary anodic oxidation in an oxalic acid solution; (6) finally, performing pore broadening on the aluminum sheet. The porous alumina template prepared by use of the preparation method has the advantages of high degree of order, stable preparation method and the like, and is suitable for industrial popularization and utilization.

Description

Technical field [0001] The invention belongs to the technical field of nanoimprinting, and specifically relates to a preparation method of a porous alumina template. Background technique [0002] The main component of anodic aluminum oxide (AAO) is Al2O3, and the porous alumina template is made by oxidizing high purity aluminum (99.999%) in the corresponding acidic electrolytic solution. Among them, metal aluminum is used as the anode, and under specific working conditions and external field action, an oxide film with a thickness of 1-50 μm is formed on the surface of the anode. The formed micropores have a very regular structure and a high degree of anisotropy. The pore diameter is controllable from 10 to 500 nm, and the pore density is about 10 9 ~10 11 / cm 2 . In addition to being used as a template for the synthesis of nanostructured materials, porous alumina membranes can also be used as filtration membranes for separation and purification, as semi-permeable membranes in th...

Claims

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Application Information

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IPC IPC(8): C25D11/12C25D11/16C25D11/24B82Y40/00
CPCC25D11/12B82Y40/00C25D11/16C25D11/24
Inventor 万光会肖延安
Owner WUXI IMPRINT NANO TECH
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