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Lanthanum or yttrium doped aluminum zinc oxide powder and codeposition-supercritical fluid drying method for preparing the same

A zinc-aluminum oxide and supercritical fluid technology, applied in the field of materials, can solve the problems of serious powder agglomeration, good nano-powder materials, and inability to obtain dispersibility, and achieve the elimination of powder agglomeration, simple process, and easy product particle size Effect

Inactive Publication Date: 2006-10-25
XIAN POLYTECHNIC COLLEGE
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, during the powder drying process of this method, due to the formation of bridging and bonding between the adsorbed water molecules on the surface of adjacent particles and the hydrogen bonded surface OH groups, the degree of agglomeration between the powders is serious, and it is impossible to obtain nanoparticles with good dispersibility. Powder material

Method used

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  • Lanthanum or yttrium doped aluminum zinc oxide powder and codeposition-supercritical fluid drying method for preparing the same
  • Lanthanum or yttrium doped aluminum zinc oxide powder and codeposition-supercritical fluid drying method for preparing the same
  • Lanthanum or yttrium doped aluminum zinc oxide powder and codeposition-supercritical fluid drying method for preparing the same

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Embodiment 1

[0025] Objective: To prepare lanthanum-doped ZAO nanopowder

[0026] Method: co-precipitation-supercritical fluid drying preparation method

[0027] Process: 1 Prepare ethanol-water (60vol%) mixed solution.

[0028] 2 Weigh PEG (polyethylene glycol 10000, the addition amount is 2.4-3.0% of the mass of the ZAO powder), add it to the above ethanol-water solution and stir to obtain a colorless and transparent solution 1.

[0029] 3 Weigh crystalline zinc chloride (ZnCl 2 ) and aluminum chloride (AlCl 3 ), dissolved in solution 1, and prepared into solution 2 with zinc chloride concentration of 1mol / L, AlCl 3 The amount of addition is based on ZnO: Al 2 o 3 =97:3 (mass ratio) weighing. Weigh La 2 o 3 Dissolved in nitric acid solution, the prepared La(NO 3 ) 3 The solution was redissolved in solution 2.

[0030] 4. During the process of stirring the above-mentioned solution 2, continuously add ammonia water with a concentration of 25% in mist form, and at the same time c...

Embodiment 2

[0035] The method of use is the same as in Example 1, and the supercritical fluid drying link is introduced in the drying process of the powder. After the precipitate synthesized by co-precipitation is washed with deionized water and ethanol, the ethanol solvent has no obvious liquid-gas interface under critical conditions. Non-shrinkage liquid phase drying is carried out to eliminate or reduce the degree of agglomeration between zinc-aluminum composite oxide nanopowders. The critical conditions of the ethanol solvent are temperature: 533K, atmospheric pressure: 7.5MPa, and the prepared zinc-aluminum composite oxide nanopowder doped with rare earth element lanthanum or yttrium has an average particle size of about 60nm, a particle shape close to spherical, and a dense fine grain. Organization, better dispersion and smaller particle size distribution, uniform particles.

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Abstract

The invention relates to a zinc-aluminum oxide powder doped with lanthanum or yttrium and a co-precipitation-supercritical fluid drying preparation method. After the precipitate synthesized by liquid-phase co-precipitation is washed with deionized water and ethanol, it is washed with ethanol solvent under supercritical conditions. No shrinkage drying under the characteristics of no obvious liquid-gas interface, which combines the advantages of both, eliminates or reduces the agglomeration between zinc-aluminum composite oxide nanopowders, and realizes doping, Al 2 o 3 The mass ratio to ZnO is 3:97. High powder output ratio, simple method, easy control of product particle size, and low cost. The prepared powder has a hexagonal wurtzite crystal structure, small agglomeration among powders, good dispersion, particle size less than 100nm, and dense fine-grained structure. The invention solves the problem of powder agglomeration, can be sintered into various shapes, and has excellent photoelectric performance as a target material. Using magnetron sputtering, vacuum evaporation and other methods to prepare transparent electrodes for flat display devices such as liquid crystal and plasma, and solar cells on the substrate.

Description

technical field [0001] The invention relates to the field of materials, and mainly relates to zinc-aluminum oxide nanopowder in inorganic non-metallic materials and a preparation method thereof, specifically a zinc-aluminum oxide powder doped with lanthanum or yttrium and a co-precipitation-supercritical fluid drying preparation method. Background technique [0002] ITO film is the main representative of transparent conductive oxide film. It has excellent photoelectric properties such as band gap, high visible light transmittance and low resistivity. It is widely used in flat panel display, solar cell, special function window coating and other optoelectronic devices. Although ITO thin films have good photoelectric properties, since indium is a noble metal, the corresponding targets used for plating indium tin oxide (ITO) thin films are also very expensive. Another kind of oxide film, the visible light transmittance of zinc aluminum oxide (ZAO) film > 80%, resistivity is i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/10C04B35/622
Inventor 杨觉明李建平包小平陈平张海礁
Owner XIAN POLYTECHNIC COLLEGE
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