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Preparation method for synthesizing crystalline/amorphous ultrafine zinc oxide (ZnO) powder at high efficiency

A technology of zinc oxide powder and amorphous state, which is applied in the field of high-efficiency synthesis of crystalline and amorphous ultrafine zinc oxide powder, can solve the problems of high supersaturation ratio of zinc hydroxide, difficult operation, etc. Achieve the effect of uniform particle size, simple equipment and low cost

Inactive Publication Date: 2012-05-30
DALIAN CHUANGDA TECH TRADE MARKET
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the optimized process conditions in the above technology, maintain a high supersaturation ratio of zinc hydroxide in the reactor, and have a large rate of temperature rise and fall, so that the operation is difficult and the preparation conditions are harsh.
[0004] The present invention adopts the solid-state thermal decomposition technology to solve the problems of high supersaturation ratio of zinc hydroxide in the background technology, large temperature rise and temperature drop rates, difficult operation and harsh preparation conditions

Method used

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  • Preparation method for synthesizing crystalline/amorphous ultrafine zinc oxide (ZnO) powder at high efficiency
  • Preparation method for synthesizing crystalline/amorphous ultrafine zinc oxide (ZnO) powder at high efficiency
  • Preparation method for synthesizing crystalline/amorphous ultrafine zinc oxide (ZnO) powder at high efficiency

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specific Embodiment approach

[0008] Detailed ways (a) in Fig. 1 is the present invention at 250 0 The X-ray diffraction pattern of C heat treatment, (b) is the present invention at 160 0 X-ray diffraction pattern of C heat treatment.

[0009] (a) and (b) in Fig. 2 are the present invention at 200 0 C, 250 0 C is the transmission electron micrograph of heat treatment; (c) is the present invention at 160 0 C Transmission electron microscope image of heat treatment.

[0010] (a) in Fig. 3 is the present invention at 160 0 C photoluminescence spectrum during heat treatment, (b) is the present invention at 25 0 Photoluminescence spectra during heat treatment at 0C.

Embodiment 1

[0011] Example 1: Preparation of amorphous ultrafine ZnO: Weigh 2g Zn (CH 3 COO) · 2H 2 O and ZgNHCO 3 Place in a mortar and mix thoroughly. Place the mixture on a quartz boat in a tube furnace under NZ flow at 16O O C heat treatment for 3 hours, cooling water washing, and drying the product at 90°C for 3 hours to obtain white ZnO·H 2 O 0. 86g, yield 95. 3%. The temperature in the furnace can be between 150 – 170 0 C option, the heat treatment time can be selected from 1-5 hours. At this time, amorphous ultrafine ZnO was prepared.

Embodiment 2

[0012] Example 2: Preparation of crystalline nano-ZnO: Weigh 2g Zn (CH3COO) · 2H 2 O. with 2gNHCO 3 Place in a mortar and mix thoroughly. Place the mixture on a quartz boat at N 2 Flow down in a tube furnace at 25O 0 C heat treatment for 3 hours, cooling water washing, the product 90 0 C was dried for 3 hours to obtain 0.69 g of off-white 25nm ZnO with a yield of 94%. The temperature in the furnace can be between 180 - 300 0 C option, heat treatment time can be selected from 1 - 5 hours. At this time, crystalline ultrafine ZnO was prepared.

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Abstract

The invention belongs to the field of fine inorganic chemical material preparation and relates to a preparation method for synthesizing crystalline / amorphous ultrafine zinc oxide (ZnO) powder at high efficiency. The invention improves the method of preparing ZnO by high temperature pyrolysis of Zn(OH)2 based on sol-gel method. In the invention, solid-state zinc salt and sodium bicarbonate are mixed at a given proportion, and then thermal decomposition is carried out at a given temperature to prepare ultrafine ZnO powder. Amorphous / crystalline ZnO can be synthesized according to decomposition temperature. The inventive preparation method for synthesizing crystalline / amorphous ultrafine ZnO powder at high efficiency by solid-phase low-temperature thermal decomposition involves simple equipment, and has simple operation, low cost, and high yield (95% or higher). The prepared crystalline ZnO has a uniform particle size which can be well controlled within 10-50 nm, and the prepared amorphous ZnO has strong ultraviolet emission. The invention can find wide application in electronic, daily chemical, building material, painting and rubber products, and further find wide application in chemical sensors, high-frequency piezoelectric resonant cavities, photocells, ultraviolet light emitting devices, etc., as electronic material, and is an important fine chemical material.

Description

technical field [0001] The invention belongs to the field of preparation of fine inorganic chemical materials, in particular to a preparation method for efficiently synthesizing crystalline and amorphous ultrafine zinc oxide powders. Background technique [0002] At present, the method commonly used to prepare ultrafine ZnO powder is sol-gel pyrolysis of Zn ( OH ) 2 : Preparation of ZnO. Such as the urea hydrolysis method developed in China, this method uses urea and zinc nitrate as raw materials to synthesize nano-zinc oxide. In order to ensure product quality, this method requires process conditions to maintain suitable reaction kinetics conditions. Contents of the invention [0003] In order to solve the problem of optimizing the process conditions in the above technology, maintaining a high supersaturation ratio of zinc hydroxide in the reactor, and having a relatively high rate of temperature rise and fall, the operation is difficult and the preparation conditions ...

Claims

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Application Information

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IPC IPC(8): C01G9/03
Inventor 王爽
Owner DALIAN CHUANGDA TECH TRADE MARKET
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