Preparation method of aluminum doped zinc oxide nano powder

Abstract

The invention discloses a preparation method of aluminum doped zinc oxide nano powder. A technological process of the preparation method is shown as follows: first synthesizing a zinc nitrate-urea white sol microemulsion, standing, then filtering, adding aluminum nitrate into a filtering liquid to form a zinc nitrate aluminum mixed solution; preparing a sodium carbonate solution, dropping both the sodium carbonate solution and the zinc nitrate aluminum mixed solution into a polyvinyl alcohol aqueous solution to synthesize a white precipitate precursor; standing and filtering, and thus obtaining the aluminum doped zinc oxide nano powder through deionized water leaching, drying, grinding, sieving and calcining of a filter cake. The aluminum doped zinc oxide nano powder obtained by the method has good dispersibility and less agglomeration, the powder particle size is between 5 and 30 nm, the particle size distribution range is narrow, and the morphology is spherical or quasi spherical. The method has the advantages of simple process, low cost, short reaction period, high yield, and easy control of the reaction processes, and is suitable for mass production; and compared with traditional methods, the powder produced by the method contains no chlorine ion which can influence the performance of the powder, and the method needs no ethanol for washing, and no alkali for neutralization.

Description

technical field [0001] The invention belongs to the field of nanometer materials. The invention relates to the preparation of a zinc oxide and aluminum-doped zinc oxide nanometer material with gas-sensing performance and photoelectric performance. More specifically, it relates to the preparation of zinc oxide and aluminum-doped zinc oxide nanopowder materials that can be used in the fields of gas sensors, transparent conductive electrodes, catalysts, catalyst carriers and the like. Background technique [0002] Zinc oxide and aluminum-doped zinc oxide are important gas-sensing materials, transparent conductive electrode materials, catalysts and catalyst carrier materials. In recent years, the preparation of ZnO and Al-doped ZnO nanopowders has attracted more and more attention. This is mainly because the smaller the particle size of the powder, the larger the specific surface area of ​​the powder, so that the performance of the device prepared by using the powder is better...

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Problems solved by technology

[0004] There are some shortcomings in the above-mentioned various methods. For example, if chlorine salt is used as raw material, there will be problems such as the difficulty in washing chloride ions, the residual chloride ions in the powder will corrode the device, and hinder the densification of the target material; The glue method or non-basic solution method has problems such as serious waste of organic matter, high cost and serious agglomeration; if the hydrothermal or alcohol thermal method is used, there are difficulties such as expensive equipment, low output, and difficult industrial production; if the solid phase synthesis method is used, there are powders Low purity, wide range of particle size distribution and other defects; other methods also have problems such as the use of organic reagents, a large amount of lye for neutralization, and a large amount of ethanol washing.

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