Preparation method of double-sided uniform porous anodized aluminum nano-template

Abstract

The invention discloses a method for preparing a porous anode aluminum oxide nanotemplate with two consistent faces, and relates to the material technology. The method comprises the following steps that firstly, an aluminum sheet is polished; secondly, the aluminum sheet serves as an anode, graphite serves as a cathode, and a first-time electrochemical anode hard oxidation reaction is carried out to form a porous oxidation layer; thirdly, an acid mixed solution of CrO3 with the concentration of 0.1mol / L to 0.5mol / L and H3PO4 with the concentration of 0.2mol / L to 0.5mol / L is adopted to remove the porous oxidation layer formed through first-time oxidation; fourthly, the pit-contained aluminum sheet treated in the step three serves as the anode, the graphite serves as the cathode, a second-time electrochemical anode hard oxidation reaction is carried out to obtain the ordered porous anode aluminum oxide nanotemplate; fifthly, the rest of aluminum is removed; and sixthly, a blocking layer is removed, broaching is carried out, and the ordered porous anode aluminum oxide nanotemplate with the two consistent faces is obtained. The method ensures consistency of the positive face and the reverse face of the AAO template and ordering of a nano structure; and the problem that the consistency of the two faces obtained through a one-time anode hard oxidation method is poor is solved.

Description

technical field [0001] The invention relates to material technology, in particular to a method for preparing a porous anodized aluminum nano template. Background technique [0002] The main component of the porous anodized aluminum oxide (AAO) template is Al 2 o 3 , is produced by anodic oxidation of high-purity aluminum (99.999%) in the corresponding acidic electrolytic solution. Among them, metal aluminum is used as the anode. Under certain external electric field and specific working conditions, the reaction time is controlled, and an oxide film with a thickness of tens to hundreds of microns is formed on the surface of the anode aluminum. The nanopore arrangement in the final formed alumina template has a highly ordered hexagonal periodic structure, the pore spacing and pore diameter can be tens to hundreds of nanometers, and the pore density is about 10 9 ~10 11 / cm 2 . AAO templates are widely used in the preparation of various ordered nanomaterials and devices, ...

AI Technical Summary

Problems solved by technology

However, the low-pressure pre-oxidation and step-by-step boosting process make the front order of the alumina template prepared by the one-time hard anodic oxidation method very low, and the consistency of the hole morphology on both sides cannot be guaranteed.

[0006] In summary, although oxalic acid is currently used as the electrolyte, the AAO template prepared by the secondary anodic soft oxidation method is the best, but there are some defects, such as: slow reaction speed, long preparation cycle, and small pore spacing. lead to high hole density

Although increasing the voltage can increase the reaction speed and hole spacing, but using the soft oxidation method, when the voltage exceeds the limited range, the oxide film layer will be broken down and damaged

Although the growth rate and pore spacing of the AAO template can be significantly increased by the one-time hard anodic oxidation method, the preparation cycle is shortened, and the pore density is reduced, but the frontal order of the alumina nano-template prepared by the current one-time hard anodic oxidation method Very low, unable to guarantee the consistency of hole morphology on both sides

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