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Method for synthesizing large-sized zinc oxide crystals by using microwaves

A microwave synthesis, large-scale technology, applied in chemical instruments and methods, crystal growth, self-solid, etc., can solve the problem of small zinc oxide single crystal size

Active Publication Date: 2017-08-18
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the current technology of preparing zinc oxide single crystal by microwave synthesis, the size of the prepared zinc oxide single crystal is small, and the largest one is only millimeter-sized, which cannot be called large size.

Method used

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  • Method for synthesizing large-sized zinc oxide crystals by using microwaves
  • Method for synthesizing large-sized zinc oxide crystals by using microwaves
  • Method for synthesizing large-sized zinc oxide crystals by using microwaves

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Experimental program
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Effect test

Embodiment 1

[0035] Graphite powder with an average particle size of 2 μm, high-purity zinc oxide with an average particle size of 1 μm and copper particles with an average particle size of 1 mm are used as raw materials, and the powders are weighed according to the mass of C: ZnO: copper particles of 2.25 grams, 4.5 grams and 0.475 grams. Then mix in a mortar and mortar for 30 minutes so that it is well combined. The prepared raw materials were put into a quartz crucible with an inner diameter of 45 mm, placed in a microwave muffle furnace for reaction synthesis, the heating rate was 30 °C / min, the synthesis temperature was 1100 °C, and the temperature was kept for 1 h. After cooling with the furnace, the white needle-shaped product obtained on the inner wall of the crucible is the needle-shaped zinc oxide crystal with a length of 1 to 2 cm. The white needle-shaped product was detected, and the results were as follows: Figure 1-3 shown.

Embodiment 2

[0037] Activated carbon powder with an average particle size of 3 μm, high-purity zinc oxide with an average particle size of 1 μm and copper particles with an average particle size of 0.1 mm are selected as raw materials, and the mass of C: ZnO: copper particles is 2.25 grams, 2.25 grams and 0.25 grams. Take the powder and mix it in a mortar for 40 minutes to make it evenly mixed. The prepared raw materials were put into a quartz crucible with an inner diameter of 45mm, placed in a microwave muffle furnace for reaction synthesis, the heating rate was 10°C / min, the synthesis temperature was 1050°C, and the temperature was kept for 1.5h. After cooling with the furnace, the white needles obtained on the inner wall of the crucible are needle-shaped zinc oxide crystals, such as Figure 4 shown.

Embodiment 3

[0039] Choose graphite powder with an average particle size of 3 μm, high-purity zinc oxide with an average particle size of 1 μm, and copper particles with an average particle size of 0.5 mm as raw materials, and weigh the powder according to the mass of C: ZnO: copper particles: 2.25 grams, 3.25 grams, and 0.275 grams , then mix in the mortar for 30 minutes to combine well. The prepared raw materials were put into a quartz crucible with an inner diameter of 45mm, placed in a microwave muffle furnace for reaction synthesis, the heating rate was 20°C / min, the synthesis temperature was 1100°C, and the temperature was kept for 0.5h. After cooling down in the furnace, the white needle-shaped product obtained on the inner wall of the crucible is the needle-shaped zinc oxide crystal.

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Abstract

The invention belongs to the field of functional ceramic materials, and relates to a method for synthesizing large-sized zinc oxide crystals by using microwaves. The method comprises the following steps: weighing a certain amount of a carbon source and zinc oxide powder according to a mass ratio, and uniformly mixing the carbon source with the zinc oxide powder, thus obtaining a mixture I; adding a granular adjuvant, which is 5 to 10 percent of the mass of the mixture I, into the mixture I, and performing uniform mixing, thus obtaining a mixture II; adding the mixture II into a crucible, placing the crucible into a microwave reaction device at room temperature for heating, and after the reaction is carried out for 0.5 to 1.5 hours, growing needle-shaped crystals on the inner wall of the crucible, wherein the needle-shaped crystals are the large-sized zinc oxide crystals. With multiple excellent properties, the zinc oxide may be the next generation of a wide band gap semiconductor material; growth of large-sized single crystals has an important significance for both basic research and actual application; by the adoption of the microwave synthesis technology, a new simple and convenient way is provided for preparation of a large-sized zinc oxide single crystal material, thus promoting application of the material and technology development.

Description

technical field [0001] The invention belongs to the field of functional ceramic materials and relates to a method for synthesizing large-sized zinc oxide crystals by using microwaves. Background technique [0002] Large-sized zinc oxide crystal is an important functional crystal material with excellent optical and electrical properties, and has broad application prospects in many fields such as LED field, information display and storage, optical communication and missile early warning. Judging from the current research status of preparing zinc oxide crystals, the growth technology of large-sized zinc oxide single crystals is full of difficulties. For example, the ZnO single crystal is grown by the pulling method. Due to the high vapor pressure of ZnO, a high-pressure environment is required, and precise control is required during the growth process, which is technically difficult. Hydrothermal growth of zinc oxide single crystals is currently the most mature method, but its...

Claims

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Application Information

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IPC IPC(8): C30B29/16C30B29/62C30B1/10C30B30/00
CPCC30B1/10C30B29/16C30B29/62C30B30/00
Inventor 梁宝岩张旺玺张艳丽
Owner ZHONGYUAN ENGINEERING COLLEGE
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