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Method for preparing nanometer SnO2 through self-propagation high-temperature synthesizing technology

A self-propagating high-temperature, nanotechnology, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of affecting the reaction effect, easy moisture absorption during storage, and low product yield. Extended spraying time, simple and easy operation process, promotes fully completed effect

Inactive Publication Date: 2015-09-30
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the product yield is not high
Moreover, if the prepared raw material powder is not reacted in time, it is easy to absorb moisture during storage and affect the reaction effect

Method used

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  • Method for preparing nanometer SnO2 through self-propagation high-temperature synthesizing technology
  • Method for preparing nanometer SnO2 through self-propagation high-temperature synthesizing technology
  • Method for preparing nanometer SnO2 through self-propagation high-temperature synthesizing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 45.5% Al+CuO (strictly in accordance with the reaction ratio, that is, the molar ratio is 2:3) and 54.5% Sn powder, stir evenly, put figure 1 Inside the graphite crucible shown. Then sprinkle the ignition powder on the surface of the powder, insert the fuse to ignite the reaction. After the reaction is completed, the product is completely collected in a pre-placed collection device.

[0031] The collected product was weighed, and the output was 5.5g, and then the prepared product was observed with a field emission scanning electron microscope, as shown in the photo figure 2 shown. It can be seen from the figure that the morphology of the product is linear, and the diameter distribution range is narrow, concentrated around 85nm, that is, nanowires. Finally, the product was also analyzed by X-ray diffraction, and the analysis results were as follows: image 3 shown. It can be seen from the diffraction peaks in the figure that the crystallization of the product i...

Embodiment 2

[0033] The mass fractions are 44% Al+CuO (strictly according to the reaction ratio, that is, the molar ratio is 2:3), 52% Sn powder and 4% CaF 2 Mix the powder, stir well, put in figure 1 Inside the graphite crucible shown. Then sprinkle the ignition powder on the surface of the powder, insert the fuse to ignite the reaction. After the reaction is completed, the product is completely collected in a pre-placed collection device.

[0034] The collected product is weighed, and the output is 7g, which is the same as that without adding CaF 2 Compared with the production increased by 27.2% (without adding CaF 2 The hourly output is 5.5g) Then the morphology of the prepared product was observed by field emission scanning electron microscope, and the result showed that the prepared product was SnO 2 Nanowire, the product has high purity.

Embodiment 3

[0036] The mass fractions were 44% of Al+CuO powder (strictly according to the reaction ratio, that is, the molar ratio of 2:3), 52% of Sn powder and 4% of CaF 2 Mix the powder and stir evenly, then pour the powder into the powder chamber. Then, put it under the hydraulic testing machine, the preset pressure is 30MPa. Under the action of the upper and lower pressure heads, the powder is compacted. After reaching the preset pressure, the pressure is kept for 5 seconds, and then unloaded. Unscrew the bolts around the mold, take out the compacted powder and put it in figure 1 Inside the graphite crucible shown. Then sprinkle the ignition powder on the surface of the powder, insert the fuse to ignite the reaction. After the reaction is completed, the product is completely collected in a pre-placed collection device.

[0037] The collected product was weighed, and the yield was 8.4 g, a 20% increase in weight compared to the previous unpressurized (7 g unpressurized yield). Su...

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Abstract

The invention relates to a method for preparing nanometer SnO2 through the self-propagation high-temperature synthesizing technology, and belongs to the technical field of nanometer manufacturing. The method includes the steps of evenly stirring reaction raw materials composed of, by mass, 44-45% of thermite, 52-54% of Sn powder and 1-4% of CaF2 powder, pouring the reaction raw materials in a die for containing powder, and compacting the powdery reaction raw materials under a hydraulic testing machine, wherein the pressure ranges from 30 MPa to 150 MPa; taking out the compacted powdery raw materials and placing the materials in a graphite crucible, scattering pyrophoric powder, inserting a safety fuse, igniting the safety fuse so that the self-propagation high-temperature synthesizing reaction can be generated, and collecting nanometer stannic oxide through a preset collecting device above the graphite crucible. According to the method, by exerting appropriate mechanical pressure on the powdery raw materials, the powder makes full contact, and therefore the reaction can be promoted to be sufficiently completed, yield is improved, and the whole operation process is easy, convenient and feasible.

Description

technical field [0001] The invention relates to a method for preparing nano-SnO by self-propagating high-temperature synthesis technology 2 The method belongs to the field of nanometer manufacturing technology. Background technique [0002] Tin oxide is a typical n-type wide bandgap (bandgap width 3.6eV) semiconductor material with excellent photoelectric performance, gas sensitivity and chemical stability. It is used in gas sensors, field effect transistors, liquid crystal displays, solar cells, Transparent electrodes and other fields have broad application prospects. The nanonization of tin oxide provides a new idea for improving the traditional application performance of tin oxide and developing new application fields. If the size of the tin oxide particles is reduced to a few nanometers, the sensitivity of the gas sensor will rise sharply, and the catalytic ability of the material will also be significantly improved. Moreover, tin oxide nanowires exhibit unique optica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82Y30/00
Inventor 张国栋张泽荣张晖刘念
Owner WUHAN UNIV
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