Preparation method of ZnO/Bi2O3 composite powder

Abstract

The invention relates to a preparation method of ZnO/Bi2O3 composite powder. The method comprises the following steps: reacting a zinc nitrate solution with a certain concentration with an ammonium bicarbonate solution to obtain basic zinc carbonate, filtering and washing the basic zinc carbonate, dispersing into a slurry, adding the ammonium bicarbonate solution to continue the reaction for some time, slowly adding a bismuth nitrate solution, and completely reacting until the bismuth precipitate is completely coated on the zinc precipitate surface, thereby finally obtaining the simultaneous core-shell structure ZnO/Bi2O3 nano powder. The technique saves a plurality of drying and roasting links, and more importantly, can implement uniform coating by controlling the state of the precursor and enhance the combination compactness between the coating and base. The ZnO/Bi2O3 composite powder prepared by the method has the advantages of uniform particles and small particle size; and the sintered ZnO pressure-sensitive ceramic has high compactness.

Description

technical field [0001] The present invention relates to a kind of ZnO / Bi 2 o 3 A method for preparing composite nanomaterials, more precisely, the present invention relates to a method for preparing ZnO / Bi with a core-shell structure by an in-situ coating method 2 o 3 The nano powder method belongs to the technical field of composite nano powder preparation. Background technique [0002] ZnO is a II-VI wide bandgap direct bandgap wide bandgap semiconductor compound material, its bandgap at room temperature is 3.37eV, it has n-type semiconductor conductivity, it is a hexagonal wurtzite crystal structure, and its crystal form belongs to the hexagonal crystal system . ZnO nanomaterials have small scale, huge surface area, stable performance, outstanding photoelectric response characteristics, and ultra-fast time effect, so ZnO is widely used in building detectors, photovoltaic fields, and degrading organic pollutants; ZnO varistor electronic ceramics are based on ZnO is a ...

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Problems solved by technology

[0003] At present, the preparation methods of zinc oxide pressure-sensitive composite powder are mainly divided into two categories: solid-phase mechanical ball milling method and liquid-phase chemical method; the core-shell nanocomposite particles prepared by high-energy ball milling method doped with metal particles reported by Wang Wei et al. However, the obtained composite powder has fuzzy appearance, large particle size, and long stirring time. Although the solid phase mechanical ball milling method is simple to operate and low in cost, the product has low purity and uneven particle distribution; the surface coating of the powder is Use physical or chemical methods to treat the particle surface, consciously change the physical and chemical properties of the particle surface, design and prepare nano-zinc oxide with core-shell structure through surface coating technology, and then improve the sintering and microstructure of pressure-sensitive ceramics It is of great significance to promote the application of zinc oxide nanopowders in electronic ceramics; the properties of nanoparticles coated by mechanical ball milling have been improved, but the binding force of the core-shell structure is not strong, and the coating effect is not good. very good

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