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Method for modifying surface of aluminum electrode foil

An aluminum electrode foil and surfactant technology, applied in circuits, capacitors, electrical components, etc., can solve the problems of destroying electrostatic balance and increasing hydrophilicity, and achieve the effects of good adhesion, improved coverage and uniformity

Inactive Publication Date: 2007-12-26
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Al 2 o 3 Belonging to ionic crystals, after the surface ions lose the outer layer ions, the electrostatic balance is destroyed, and an "electric double layer effect" will be generated on the surface due to polarization (Zhu Lubing, Bao Xing. Surface and Interface Physics. Tianjin: Tianjin University Press , 1992), so that the surface of the crystal film has a negative potential, so that in an acidic solution with a lower pH value, Al 2 o 3 The surface of the membrane will adsorb H in the solution + , forming Al-OH 2 (Zhang Lide, Mou Jimei. Nanomaterials and Nanostructures. Beijing: Science Press, 2001), leading to Al 2 o 3 The surface of the membrane has a positive potential, especially after surface cleaning and other processes, its hydrophilicity is greatly increased

Method used

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  • Method for modifying surface of aluminum electrode foil

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Experimental program
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Effect test

Embodiment 1

[0030] The aluminum electrode foil with a size of 0.5cm×4.5cm was ultrasonically cleaned with acetone for 5 minutes, dried at room temperature, immersed in a solution of γ-aminopropyltriethoxysilane with a mass fraction of 100%, and surface modified at room temperature for 10 minutes. Rinse first with deionized water and then with ethanol solution, and dry. At -15°C, immerse in a polymerization solution containing a molar ratio of pyrrole: ammonium persulfate: sodium dodecylbenzenesulfonate: p-nitrophenol for 4 hours, and then use deionized Wash with water and absolute ethanol, dry; repeat the step of impregnating the aluminum electrode foil with the polymerization reaction solution twice, and obtain the SEM photo of the aluminum electrode foil coated with a conductive polypyrrole film on the surface, as shown in Figure 1.

Embodiment 2

[0032] Clean the aluminum electrode foil with a size of 0.5cm×4.5cm ultrasonically with methanol for 5 minutes, dry it at room temperature, and then immerse it in a solution of vinyltrioxysilane with a mass fraction of 100%, and perform surface modification treatment at room temperature for 120 minutes. Rinse with water and then with ethanol solution, and dry. At -15°C, immerse in a polymerization solution containing a molar ratio of pyrrole: ammonium persulfate: sodium dodecylbenzenesulfonate: p-nitrophenol at 1:0.20:0.04:0.08 for 4 hours, and then use deionized Wash with water and absolute ethanol, and dry. The SEM photo of the aluminum electrode foil coated with a conductive polypyrrole film is shown in FIG. 2 .

Embodiment 3

[0034] The aluminum electrode foil with a size of 0.5cm×4.5cm was ultrasonically cleaned with ethanol for 5min, dried at room temperature, immersed in a solution of 0.5% γ-aminopropyltriethoxysilane in mass fraction, and surface modified at room temperature for 120min. Rinse with deionized water and ethanol solution, and dry. At -15°C, immerse in a polymerization solution containing a molar ratio of pyrrole: ammonium persulfate: sodium dodecylbenzenesulfonate: p-nitrophenol 1: 0.25: 0.04: 0.10 for 4 hours, and then use deionized Wash with water and absolute ethanol, and dry. The SEM photo of the aluminum electrode foil coated with a conductive polypyrrole film is shown in Figure 3.

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Abstract

The invention is related to method for modifying surface of porous Al2O3 substrate of aluminum foil for electrode. The method includes steps: using organic solvent to clean out, and air-dry the aluminum foil for electrode; preparing water solution of negative matter; preparing alcohol solution of silane coupler, or mixed liquor of alcohol and water; immersing the aluminum foil into the water solution of negative matter for dipping, cleaning and drying it; then, dipping it into prepared solution, and cleaning and drying it; preparing monomeric organic solutions of pyrrole, surface active agent, and dopant as well as water solution of oxidant; mixing monomeric organic solutions with water solution of oxidant to form polyreaction liquid; dipping the aluminum foil for electrode into the polyreaction liquid, and cleaning and drying it so as to obtain aluminum electrode foil with surface covered by well electric, consecutive, compact pyrrole film.

Description

technical field [0001] The invention relates to an aluminum electrode foil, in particular to an aluminum electrode foil porous Al 2 o 3 A method for modifying the surface of a substrate. Background technique [0002] Conductive polypyrrole (Polypyrrole, PPY for short) film is a new type of conductive polymer functional material. The conductive PPY film is deposited on the dielectric film Al of the aluminum electrode foil 2 o 3 The surface is used as the cathode electrode to replace the original cathode of the working electrolyte with high resistivity, which can effectively reduce the equivalent series resistance of the capacitor, so that the capacitor has the characteristics of excellent impedance frequency characteristics, high reliability and easy chip formation ( Lin Xueqing, Hong Xuebao. Engineering Technology of Aluminum Electrolytic Capacitors. Xiamen: Xiamen University Press, 2007). But Al 2 o 3 Belonging to ionic crystals, after the surface ions lose the outer ...

Claims

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Application Information

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IPC IPC(8): H01G9/045H01G9/048
Inventor 熊兆贤贺雄飞
Owner XIAMEN UNIV
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