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Method for regulating zinc oxide crystal microstructure by using hydrogen peroxide

A technology of hydrogen peroxide and zinc oxide, which is applied in the direction of zinc oxide/zinc hydroxide, nanotechnology for materials and surface science, nanotechnology, etc., which can solve the problems of difficult guarantee of process reliability, environmental pollution, and consistent shape and size of ZnO Problems such as sex and uniformity are not easy to control

Inactive Publication Date: 2012-11-28
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for regulating the microstructure of zinc oxide crystals by using hydrogen peroxide, which solves the difficulty in controlling the consistency and uniformity of ZnO morphology and size in the prior art, and requires organic additives or special synthesis methods, which is easy Cause process reliability is not easy to guarantee and the problem of environmental pollution

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  • Method for regulating zinc oxide crystal microstructure by using hydrogen peroxide
  • Method for regulating zinc oxide crystal microstructure by using hydrogen peroxide
  • Method for regulating zinc oxide crystal microstructure by using hydrogen peroxide

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Embodiment 1

[0035] Zinc oxide powder (diameter 150-230nm, arm length 800-1500nm, aspect ratio 5-7) at room temperature. Figure 4 shown) added to 2mol / L hydrogen peroxide solution (the molar ratio is ZnO:H 2 o 2 =1:20), stirred for 30min and mixed evenly, then reacted at 200°C for 6h, the resulting precipitate was washed with deionized water, centrifuged, and dried (control conditions were 65°C, 20h) to obtain zinc oxide crystals. The scanning electron micrographs of the highly crystalline rod-cluster flower-shaped ZnO crystals that were recrystallized and precipitated after being regulated by hydrogen peroxide are as follows: Figure 5 As shown, the diameter of a single rod is 400-1500 nm, the length is 30-50 μm, and the aspect ratio is 12-30.

Embodiment 2

[0037] Zinc oxide powder (such as Figure 4 shown) added to 4mol / L hydrogen peroxide solution (the molar ratio is ZnO:H 2 o 2 =1:60), stirred for 50min and mixed evenly, then reacted at 150°C for 24h, the resulting precipitate was washed with pure water, centrifuged, and dried (control conditions were 85°C, 12h) to obtain rod-cluster flower-shaped zinc oxide crystals. Scanning electron microscope photo Figure 6 As shown, the diameter of a single rod is 180-330nm, the length is 1-2.5μm, and the aspect ratio is 7-14; its photoluminescence PL spectrum is as follows Figure 7 As shown, the excitation wavelength is 300-380nm, the emission wavelength is a wide emission band of 400-700nm, and the characteristic peak is located at 570nm. It has a wide ultraviolet absorption cross section and excellent visible light emission characteristics.

Embodiment 3

[0039] Zinc oxide powder (such as Figure 4 shown) added to 8mol / L hydrogen peroxide solution (the molar ratio is ZnO:H 2 o 2=1:100), stirred for 60min and mixed evenly, then reacted at 170°C for 15h, and the resulting precipitate was washed with deionized water, centrifuged, and dried under negative pressure (control conditions were 40°C, 24h) to obtain flower cluster nano-zinc oxide Crystal (diameter 30-250nm, 600nm-1.5μm, aspect ratio 10-20), its SEM scanning electron microscope morphology photo is as follows Figure 8 shown. In addition, some ZnO nano-whiskers (with a diameter of 10-20 nm and a length of 2-4 μm) are also included.

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Abstract

The invention discloses a method for regulating zinc oxide crystal microstructure by using hydrogen peroxide, and the method comprises the following steps: step 1, adding zinc oxide powder of micro-nano scale to hydrogen peroxide or the water solution of the hydrogen peroxide at room temperature, with a mol ratio of ZnO:H2H2 =1:(20-200), and stirring uniformly to obtain a mixed solution; step 2, placing the mixed solution in a closed container for reaction at constant temperature, cooling to obtain a precipitate, and after washing the precipitate by water, centrifugal separating and drying the precipitate, obtaining the zinc crystals. The method of the invention is simple in technology, high efficiency, and environment friendly; and the obtained products are a series of zinc oxide crystals with different morphologies and sizes, displaying strong nanometer size effect.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and relates to a method for regulating the microstructure of zinc oxide crystals by using hydrogen peroxide. Background technique [0002] Zinc oxide has a hexagonal wurtzite structure at room temperature, has a large band gap (3.37eV) and exciton binding energy (60meV), and is an excellent semiconductor material. Due to the nano-effects such as surface effect and size effect, nano-zinc oxide exhibits incomparable properties of other traditional materials. Batteries, photoluminescence, photocatalytic degradation, ultraviolet shielding, acoustoelectric devices, gas-sensitive ceramics and other fields have great application value and have become research hotspots at home and abroad. The performance of zinc oxide depends on its size, shape and preparation process, so the research and control of its microstructure is also an important content in the field of nano-zinc oxide re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y30/00B82Y40/00
Inventor 张卫华夏培康张博华
Owner XIAN UNIV OF TECH
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