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Nanocrystalline metal oxide with p-n composite structure, preparation method and application of nanocrystalline metal oxide

A composite structure, nano-metal technology, applied in the direction of textiles and papermaking, fiber chemical characteristics, artificial filaments of inorganic raw materials, etc., can solve the problems of long reaction time, achieve high sensitivity, improve low sensitivity, and be easy to promote.

Inactive Publication Date: 2014-08-06
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction time of this method is relatively long

Method used

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  • Nanocrystalline metal oxide with p-n composite structure, preparation method and application of nanocrystalline metal oxide
  • Nanocrystalline metal oxide with p-n composite structure, preparation method and application of nanocrystalline metal oxide
  • Nanocrystalline metal oxide with p-n composite structure, preparation method and application of nanocrystalline metal oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Accurately weigh 2.6080g of cobalt acetate and dissolve it in 10mL of DMF, stir for 2 hours, then add 0.500g of stannous chloride, continue to stir until completely dissolved, slowly add 1.5g of PVP, continue to stir for 4 hours, pour the obtained dark blue solution into In the syringe, the static voltage is 20kV, and the advancing speed is 0.0006mm·s- 1 , The spinning was carried out under the condition that the plate spacing was 20 cm. Dry the tin foil paper with the product at room temperature for 12 hours, then collect the product and place the product in a muffle furnace, heat up at a rate of 5°C / min, and bake at 500°C for 2 hours to obtain n-SnO 2 p-Co 3 o 4 product.

[0026] The scanning electron microscopy results of the figure 1 and figure 2 , n-SnO before calcination 2 p-Co 3 o 4 The diameter of the nanofiber is 200-300nm, and the diameter of the n-SnO2p-Co3O4 nanofiber is shortened to about 150nm after calcination, and it is composed of nanoparticles...

Embodiment 2

[0028] Accurately weigh 1.3040g of cobalt nitrate and dissolve it in 7mL of DMF, stir for 4 hours, then add 0.100g of tin chloride, continue stirring until completely dissolved, then slowly add 0.8g of PVA, continue stirring for 6 hours, then pour the obtained dark blue solution into a syringe , at a static voltage of 18kV and a propulsion speed of 0.0006mm·s -1 , Spinning was carried out under the condition that the plate spacing was 18 cm. Dry the tinfoil paper with the product at room temperature for 24 hours, then collect the product and place it in a muffle furnace, heat up at a rate of 10°C / min, and bake at 500°C for 4 hours to obtain the n-SnO2p-Co3O4 product.

Embodiment 3

[0030] Accurately weigh 1.3040g of cobalt sulfate and dissolve it in 7mL of DMF, stir for 6 hours, then add 0.300g of tin chloride, continue stirring until completely dissolved, then slowly add 1.0g of PAM, continue stirring for 8 hours, then pour the obtained dark blue solution into a syringe , at a static voltage of 18kV and a propulsion speed of 0.0010mm·s -1 , The spinning was carried out under the condition that the plate spacing was 20 cm. Dry the tinfoil paper with the product at room temperature for 36 hours, then collect the product and place it in a muffle furnace, heat up at a rate of 5°C / min, and bake at 600°C for 2 hours to obtain the n-SnO2p-Co3O4 product.

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Abstract

The invention provides nanocrystalline metal oxide with a p-n composite structure and a preparation method of the nanocrystalline metal oxide. The nanocrystalline metal oxide with the p-n composite structure is prepared from nanofiber which is formed by binding SnO2 nano particles and Co3O4 nano particles in series, has the diameter of 100-200nm and is indicative of n-SnO2@p-Co3O4. The n-SnO2@p-Co3O4 composite nanofiber is prepared by means of electrostatic spinning, cobalt salt and tin salt are dissolved into N,N-dimethylformamide (DMF) to prepare a spinning solution, and the components are spun in electrostatic spinning equipment and are calcined to obtain n-SnO2@p-Co3O4 nanofiber. A gas sensor is made of the n-SnO2@p-Co3O4 nanofiber material, so that the gas sensor is high in sensitivity on low-concentration CO at low operation temperature and is suitable for detecting trace of carbon monoxide in environment.

Description

technical field [0001] The invention relates to the field of semiconductor composite nano-metal oxide preparation technology and sensing technology application, in particular to a p-n composite structure nano-metal oxide and its preparation method, and using it as a sensitive material for a semiconductor carbon monoxide sensor to measure trace amounts of carbon monoxide gas in the environment content. Background technique [0002] So far, research on gas-sensing materials based on semiconductor metal oxides has mainly focused on SnO 2 , ZnO, WO 3 and TiO 2 and other n-type semiconductors, and for p-type semiconductors, especially Co 3 o 4 Research on sensors is still in its infancy and there are few related documents. co 3 o 4 It is a transition metal oxide, cubic crystal system, space group Fd3m, with a normal spinel structure, divalent cobalt ions occupy tetrahedral positions, trivalent cobalt ions occupy octahedral positions, and have high crystal field stabilizati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F9/08D01F9/10D01D5/00D01D10/02G01N27/04
Inventor 白守礼刘海燕李殿卿罗瑞贤陈霭璠
Owner BEIJING UNIV OF CHEM TECH
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