Method for preparing white needle-shaped six-edge mono-crystalline nano-zinc oxide

Abstract

The invention relates to a method for preparing white needle-shaped six-edge mono-crystalline nano-zinc oxide. Zinc chloride and sodium hydroxide are taken as taw materials; sodium hydroxide is used as an alkaline regulator of the pH value and deionized water as solvent, cleaning agent, washing agent and vacuum drying support. The method comprises the following steps: firstly, preparing the watersolutions of zinc chloride and sodium hydroxide; mixing the water solutions; carrying out a chemical reaction in the mixed solution under the conditions of water-bath heating, stirring and water-circulation condensation; finally preparing the powdery product, that is, the white needle-shaped six-edge mono-crystalline nano-zinc oxide, through centrifugal separation, washing and vacuum drying afterthe grain growth and separation in the reaction. The method has the advantages of short preparation period, low heating temperature and low material consumption; and the product has the advantages that the morphology and the color are pure, the product is in a regular shape with the diameter being 80 to 100nm and the maximum length being 2,500nm; the preparation cost is low; the yield is as high as 65%; and the purity of the product (zinc oxide) is 99.5%.

Description

technical field [0001] The invention relates to a preparation method of white needle-shaped hexagonal single crystal nano-scale zinc oxide, which belongs to the technical field of preparation method and application of inorganic single crystal chemical substance zinc oxide. Background technique [0002] Zinc oxide is an inorganic semiconductor material with important application value. The band gap at room temperature is 3.37 eV, and the bound exciton energy is 60 meV. It is easy to be excited at room temperature. However, due to its small particle size and specific surface area Large, with surface effect, quantum size effect and Kubo effect, exhibiting many special properties, such as non-toxicity, non-migration, fluorescence, piezoelectricity, ability to absorb and scatter ultraviolet rays, and thus are widely used in photodiodes, photodetectors Recently, zinc oxide nanostructures have been found to have ultraviolet laser, piezoelectric properties and photocatalytic propert...

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Problems solved by technology

[0003] At present, the commonly used preparation methods of zinc oxide include precipitation method, which is to add a precipitant to the solution to decompose the precipitated product at high temperature; sol-gel method, hydrolysis, sol, gel, solidification and heat treatment of its oxide; gas phase The method is to heat at high temperature to oxidize, react, and cool the raw materials to form oxides; the hydrothermal method is to mix zinc salt and alkali in an autoclave to obtain oxides at high temperatures; although these methods can produce zinc oxide products , but there are some technical deficiencies, some have a long preparation period and high cost; some products have low purity and are limited in application; There are drawbacks that are not conducive to industrialization in the purification process

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