Porous aluminum oxide film light filter with bifurcate holes and preparation method thereof

A technology of porous alumina and thin-film optical filters, applied in the direction of optical filters, anodic oxidation, etc., can solve problems such as difficulty in improving efficiency, lack of filtering effect, complicated process, etc.

Inactive Publication Date: 2009-09-02
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are deficiencies in this film and its synthesis method. First, the structure of pores in the film is not periodic in the direction perpendicular to the membrane surface, making it only suitable for filtering particles or bacteria, not It has the function of filtering; secondly, in the process of reducing the pressure twice, it needs to be oxidized with different acid solutions, which makes the process complicated and difficult to improve the efficiency

Method used

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  • Porous aluminum oxide film light filter with bifurcate holes and preparation method thereof
  • Porous aluminum oxide film light filter with bifurcate holes and preparation method thereof
  • Porous aluminum oxide film light filter with bifurcate holes and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] Example 1: The preparation was completed in sequence according to the following steps: the aluminum flakes were placed in an acid solution with a concentration of 0.2 M, and the Figure 4 The shown anodic oxidation under the tooth wave voltage is 20h; among them, the purity of the aluminum sheet is 99.99%, the acid solution is oxalic acid solution, the amplitude of the tooth wave voltage is 22V, the wave front is 45 degrees, and the wave period is 3.5min. made approximately figure 1 and figure 2 shown, as image 3 The sample 5 in the curve shows a porous alumina thin film filter with bifurcated pores with a thickness of 400 nm for the backbone layer and a thickness of 70 nm for the bifurcated layer.

Embodiment 2

[0023] Example 2: The preparation was completed in sequence according to the following steps: the aluminum flakes were placed in an acid solution with a concentration of 0.25M, and the Figure 4 The shown anodic oxidation under the tooth wave voltage is 19h; among them, the purity of the aluminum sheet is 99.9%, the acid solution is oxalic acid solution, the amplitude of the tooth wave voltage is 29V, the wave front is 45 degrees, and the wave period is 3min. made approximately figure 1 and figure 2 shown, as image 3 The sample 4 in the curve shows a porous alumina thin film filter with bifurcated pores with a thickness of 350 nm for the backbone layer and a thickness of 60 nm for the bifurcated layer.

Embodiment 3

[0024] Example 3: The preparation was completed in sequence according to the following steps: the aluminum flakes were placed in an acid solution with a concentration of 0.3 M, and the Figure 4 The shown anodic oxidation under the tooth wave voltage for 17h; among them, the purity of the aluminum sheet is 99.99%, the acid solution is oxalic acid solution, the amplitude of the tooth wave voltage is 36V, the wave front is 45 degrees, and the wave period is 3min. prepared as figure 1 and figure 2 shown, as image 3 The sample 3 in the curve shows a porous alumina film filter with bifurcated pores with a thickness of 300 nm for the backbone layer and a thickness of 60 nm for the bifurcated layer.

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Abstract

The invention discloses a porous aluminum oxide film light filter with branching holes and a preparation method thereof. A light filter is provided with the holes of a porous aluminum oxide film, which are linear through-holes with the aperture of 40-60nm; the hole wall thereof is provided with more than two layers of branching holes, the aperture of each of which is 20 nm to 40nm, and the angles between the branching holes and the linear through-holes are 50 degrees to 70 degrees; a trunk layer consisting of the linear through-holes among the branching holes and a branching layer consisting of the branching holes change periodically; and the thickness of the film is 60 Mum to 180 Mum. The light filter is used for filtering light with the wave band of 500nm to 1500nm. The method comprises the following steps of placing an aluminum sheet in acid solution with the concentration of 0.2M to 0.4M and carrying out anodic oxidation for at least 5 minutes under the curved tooth wave voltage, wherein the wave amplitude of the curved tooth wave voltage is 22V to 50V, the wave front is of 45 degrees, and the wave period is 2.5 minutes to 3.5 minutes; then a porous aluminum oxide film light filter with bifurcate holes is prepared; the purity of the aluminium sheet is no less than 99.9 percent; and the anodic oxidation is carried out for 14 hours to 20 hours under the curved tooth wave voltage. The porous aluminum oxide film light filter can carry out selective filtering to the light with the wave band of 500nm to1500nm.

Description

technical field [0001] The invention relates to a thin film filter and a preparation method, in particular to a porous alumina thin film filter with bifurcated holes and a preparation method thereof. Background technique [0002] Short-wave infrared rays with a wavelength of 0.8 to 1.2 μm can penetrate the cornea of ​​the human eye and enter the eyeball. The absorption of infrared rays in this band by the human eye will lead to the formation of cataracts. Workers in the smelting industry. The main feature of the high-temperature operating environment of iron and steel metallurgical enterprises is the high temperature of strong thermal radiation, especially iron and steel smelting, red steel hot rolling and medium-sized sintering machines are typical infrared thermal radiation contact operations. Therefore, it is very necessary to prepare goggles with filtering effect to protect the health of workers. [0003] According to different filter principles, filters can be divided...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/20C25D11/04
Inventor 郑文俊费广涛王彪吴兵
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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