Dielectric-constant adjustable houghite-like membrane and preparation method thereof

A technology of dielectric constant and hydrotalcite, which is applied in the field of controllable preparation of inorganic functional thin films, can solve problems such as application reports of hydrotalcite thin film dielectric materials, and achieve strong binding force, wide practicability, and low dielectric constant Effect

Inactive Publication Date: 2009-09-23
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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  • Dielectric-constant adjustable houghite-like membrane and preparation method thereof
  • Dielectric-constant adjustable houghite-like membrane and preparation method thereof
  • Dielectric-constant adjustable houghite-like membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A. Select a flat Al sheet, first ultrasonically clean it with ethanol for 5 minutes, then ultrasonically clean it with water for 5 minutes to remove surface oil, and then place it in a sodium hydroxide solution with a concentration of 0.5 (wt)% for half a minute. When there are even air bubbles released on the surface of the substrate, take it out and rinse it with clean water, and set it aside;

[0045] B. Weigh 1.92gMg(NO 3 - ) 2 ·6H 2 O and 3.60g urea, dissolved in deionized water to make the concentration of magnesium ion is 0.075mol / L, urea and NO 3 - A 100mL mixed solution with a molar ratio of 4;

[0046] C. Put the substrate prepared in step A into the solution in step B, react at 90°C for 6 hours, take out the substrate, rinse it with deionized water, and dry it at room temperature to obtain the LDH film. The molecular formula of the hydrotalcite-like film is [Mg 2+ 1-x Al 3+ x (OH) 2 ] x+ ·(CO 3 2- ) x / 2 mH 2 O;

[0047] D. Calcining the LDH f...

Embodiment 2

[0049] A. Select a flat Al sheet, first ultrasonically clean it with ethanol for 5 minutes, then ultrasonically clean it with water for 5 minutes to remove surface oil, and then place it in a sodium hydroxide solution with a concentration of 0.5 (wt)% for half a minute. When there are even air bubbles released on the surface of the substrate, take it out and rinse it with clean water, and set it aside;

[0050] B. Weigh 1.28gMg(NO 3 - ) 2 ·6H 2 O and 2.40g urea, dissolved in deionized water to make the concentration of magnesium ion is 0.05mol / L, urea and NO 3 - A 100mL mixed solution with a molar ratio of 4;

[0051] C. Put the substrate prepared in step A into the solution in step B, react at 90°C for 6 hours, take out the substrate, rinse it with deionized water, and dry it at room temperature to obtain the LDH film. The molecular formula of the hydrotalcite-like film is [Mg 2+ 1-x Al 3+ x (OH) 2 ] x+ ·(CO 3 2- ) x / 2 mH 2 O;

[0052] D. Calcining the LDH fi...

Embodiment 3

[0054] A. Select a flat Al sheet, first ultrasonically clean it with ethanol for 5 minutes, then ultrasonically clean it with water for 5 minutes to remove surface oil, and then place it in a sodium hydroxide solution with a concentration of 0.5 (wt)% for half a minute. When there are even air bubbles released on the surface of the substrate, take it out and rinse it with clean water, and set it aside;

[0055] B. Weigh 2.56gMg(NO 3 - ) 2 ·6H 2 O and 6g urea, dissolved in deionized water to make the magnesium ion concentration 0.1mol / L, urea and NO 3 - A 100mL mixed solution with a molar ratio of 5;

[0056] C. Put the substrate prepared in step A into the solution in step B, react at 90°C for 6 hours, take out the substrate, rinse it with deionized water, and dry it at room temperature to obtain the LDH film. The molecular formula of the hydrotalcite-like film is [Mg 2+ 1-x Al 3+ x (OH) 2 ] x+ ·(CO 3 2- ) x / 2 mH 2 O;

[0057] D. Calcining the LDH film obtaine...

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Abstract

The invention relates to a dielectric-constant adjustable houghite-like membrane and a preparation method thereof, belonging to the technical field of controllable preparation of inorganic functional membrane. A pure aluminium sheet is taken as a substrate; an LDH membrane grows on the surface of the aluminium sheet; the houghite-like membrane is a compound generated by orderly assembling of interlayer anions and a plywood with positive charges; the chemical general formula of the membrane layer is (M<2+>1-xAl<3+>x(OH)2)<x+> (CO3<2->)x/2 mH2O, wherein, M<2+> stands for any one or two of divalent metal ions of Mg<2+>, Co<2+>, Ni<2+>, Cu<2+>, Fe<2+>, Mn<2+> or Zn<2+>. The numeric ranges of x and m are that x is more than or equal to 0.2 and less than or equal to 0.4 and m is more than or equal to 0 and less than or equal to 2. The structure of the houghite-like membrane is similar to brucite Mg(OH)2, and MO6 octahedron shares a seamed edge to form a plywood main body. The prepared LDH membrane is then roasted at 400 DEG-550 DEG C to obtain a composite metal oxide membrane. The dielectric-constant adjustable houghite-like membrane has the advantage that continuous adjustment for the membrane dielectric constant is realized.

Description

technical field [0001] The invention belongs to the technical field of controllable preparation of inorganic functional thin films, and in particular relates to a hydrotalcite-like thin film with adjustable dielectric constant and a preparation method thereof, the hydrotalcite-like thin film on the surface of pure aluminum and the film prepared by in-situ crystallization. By controlling the preparation conditions, the composite metal oxide film of the film has the excellent performance that the dielectric constant can be continuously adjusted in a lower range. Background technique [0002] Dielectric materials are widely used, and many types of dielectric materials are used in electrical and electronic, communication, microwave devices and microwave devices. For example, the insulating layer on the integrated circuit board, the insulating sheet in the coaxial line, the dielectric block in the loading waveguide, the dielectric cover of the antenna, and the support device and ...

Claims

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Application Information

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IPC IPC(8): C01B13/00C01B13/14C01F7/02C01G9/02
Inventor 张法智郭孝孝徐赛龙崔兆慧段雪
Owner BEIJING UNIV OF CHEM TECH
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