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Oriented growth method of ZnO micron tube

A technology of directional growth and micron tubes, applied in the directions of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of material pollution, resource waste, high production cost, etc., and achieve the effect of simple process

Inactive Publication Date: 2009-06-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microporous template method needs to make a template with regular shape and pore size in advance, and also needs a gold-plated film as a catalyst, resulting in high preparation costs; at the same time, the gold used as a catalyst needs to be removed at the end, resulting in a waste of resources. also pollute

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Embodiment 1: First, by weight, 70% micron ZnO powder and 30% nanometer ZnO powder are mixed uniformly as raw materials, and pressed into a block sample with a hollow structure, and the hollow structure is a directional growth chamber for ZnO microtubes. Then placed in a microwave field with uniform distribution in the vertical direction and uneven distribution in the horizontal direction, the block sample is heated rapidly (about 2 to 5 minutes) to a high temperature of 1300°C. In the area away from the center, because the intensity of the microwave field is low, it is a low temperature area compared with the central area. Because of the high surface activity and strong microwave absorption ability of nano-ZnO powder, it will evaporate at a lower temperature. In the low-temperature area, liquid droplets are first formed, that is, the nucleus of the ZnO tube. The vapor formed by the micron ZnO powder provides a zinc source, and ZnO absorbs microwave energy. The mechanis...

Embodiment 2

[0012] Embodiment 2: First by weight, 80% micron ZnO powder and 20% nanometer ZnO powder are mixed uniformly as raw material, pressed into a block sample of hollow structure; In a non-uniform microwave field, the bulk sample is heated rapidly (about 2 to 5 minutes) to 1300°C. Others are with embodiment 1.

Embodiment 3

[0013] Embodiment 3: First by weight, 60% micron ZnO powder and 40% nanometer ZnO powder are mixed uniformly as raw material, pressed into a block sample of hollow structure; In a non-uniform microwave field, the bulk sample is heated rapidly (about 2 to 5 minutes) to 1200°C. Others are with embodiment 1.

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Abstract

The invention is a ZnO micron tube oriented growth method, using uniformly mixed micron and nanometer ZnO powder as source to be pressed into hollow block sample; placing the block sample in a microwave field uniformly distributed not in the horizontal direction but in the vertical direction, where the block sample is heated to 1200-1300deg.C and evaporated in the cavity of the core; in the heating and evaporating course, regulating strength of microwave field and controlling sample evaporating rate by controlling microwave power and making the evaporated ZnO powder form oriented grown ZnO micrometer tube in low temperature region in the direction of microwave electric field. As compared with the existing techniques, it has advantages of simple process, no pollution, low cost and easy to implement.

Description

technical field [0001] The invention relates to the technical field of semiconductor materials and microwave heating, in particular to a method for directional growth of ZnO microtubes. Background technique [0002] Existing methods for directional growth of ZnO nanotubes or rods generally use metal-organic vapor phase epitaxy (MOVPE) and microporous template methods. The organozinc source required by metal-organic vapor phase epitaxy is generally poisonous and pollutes the environment. At the same time, sapphire is required as a substrate and a gold-plated film is used as a catalyst. The microporous template method needs to make a template with regular shape and pore size in advance, and also needs a gold-plated film as a catalyst, resulting in high preparation costs; at the same time, the gold used as a catalyst needs to be removed at the end, resulting in a waste of resources. It also causes pollution. Contents of the invention [0003] The technical problem to be sol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/16C30B29/62C30B23/00
Inventor 周建刘桂珍王琳欧阳世翕
Owner WUHAN UNIV OF TECH