Method for preparing zinc oxide micron sphere

Abstract

The invention relates to a method for preparing a semiconductor oxide nano material, in particular to a method for preparing a zinc oxide micron sphere. In the method, ultrasonic activation treatment is not needed, the pH value of solution is adjusted and the appearance of a product is controlled by using NH4F, the solution is not needed to be diluted and the yield can be improved to the maximum extent; and the solution is not needed to be stirred in the water bath heat preservation process, the temperature of heat preservation can much lower than the boiling point of water, and the method contributes to large scale industrial production.

Description

technical field [0001] The invention relates to a preparation method of semiconductor oxide nanometer materials, in particular to a preparation method of zinc oxide microspheres. Background technique [0002] Zinc oxide (ZnO) is a new II-VI wide bandgap semiconductor material, non-toxic, cheap and easy to obtain raw materials, with excellent photoelectric, piezoelectric and dielectric properties; nano-ZnO can be widely used as gas-sensing materials, catalytic Materials, antibacterial materials, and photoelectric materials, etc., have become popular research materials in the field of nanometers in the world in the past ten years. When nano-ZnO is used as a gas-sensitive or photocatalytic material, it is required to have as large a specific surface area as possible to increase the contact between ZnO and the medium. In order to improve the sensitivity of the gas sensor or enhance the photocatalytic effect, the ZnO nanosheet with a thickness of about tens of nanometers is a nan...

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Problems solved by technology

[0002]Zinc oxide (ZnO) is a new II-VI wide bandgap semiconductor material, non-toxic, cheap and easy to get raw materials, excellent photoelectricity, piezoelectricity and Dielectric properties; Nano-ZnO can be widely used as gas-sensing materials, catalytic materials, antibacterial materials and photoelectric materials, etc., so it has become a popular research material in the nano-field in the past ten years. It is required to have a specific surface area as large as possible to increase the contact area between ZnO and the medium, thereby improving the sensitivity of the gas sensor or enhancing the photocatalytic effect. The ZnO nanosheet with a thickness of about tens of nanometers is a nanometer with a large specific surface area. However, in use, the effective contact area between ZnO and the medium is reduced due to the superposition of the nanosheets themselves. If the nanosheets can be self-assembled into a spherical structure, the independence between the nanosheets can be maintained, and the Effectively overcome the agglomeration between spheres, it will be an ideal nanostructure with large specific surface area, which can be used in the fields of gas sensing, photocatalysis, and dye-sensitized solar cells. There are only a few reports on the preparation of ZnO microspheres constructed from nanosheets , for example, Chinese patent (CN 101249979 B) reports a normal-pressure water-bath preparation method of prickly ball-shaped zinc oxide. Stirring, another document (Journal of Crystal Growth 282 (2005) 165–172) reported a similar ZnO nanostructure, and its preparation method used the solvothermal method with absolute ethanol as the medium, and the solvent temperature was as high as 190°C

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