Preparation method of c@ ferric oxide composite nanomaterial with porous structure as well as product and application of c@ ferric oxide composite nanomaterial

A technology of composite nanomaterials and porous structures, which is applied in the field of preparation of C@ferric oxide composite nanomaterials, can solve the problems of poor electrical conductivity of semiconductor metal oxides, improve gas sensing performance, increase specific surface area, and improve the preparation process. simple effect

Active Publication Date: 2019-03-22
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fe 2 o 3 As a gas-sensitive material, it has always been concerned by the scientific research community and the industry. However, the conductivity of semiconductor metal oxides is poor. By matching with carbon materials, its conductivity can be improved, thereby improving the gas sensitivity of the material.

Method used

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  • Preparation method of c@ ferric oxide composite nanomaterial with porous structure as well as product and application of c@ ferric oxide composite nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 10g of egg white and deionized water, mix and stir, the concentration of egg white is 30wt%, filter and remove the white floc in the egg white solution, and obtain solution A;

[0020] According to the molar concentration of 0.05mol / L with FeSO 4 ·7H 2 O aqueous solution, after stirring for 30min, add ethylene glycol to the above solution, the volume ratio of ethylene glycol and deionized water is 1:1, stir for 10min, to obtain solution B;

[0021] Mix solution A and solution B, the volume ratio of solution A and solution B is 1~3; after stirring for 30 minutes, heat the solution to 60 °C under stirring, keep the solution for 8 hours, then cool the solution to room temperature, and put the obtained product at -80 ℃ freeze-drying; the dried samples were placed in a tube furnace, and heat-treated in a high-purity nitrogen gas atmosphere. The heat treatment temperature was 300°C for 2 hours, 500°C for 2.5h, and the heating rate was 2°C / min. Grinding to obtain C@Fe ...

Embodiment 2

[0024] Take 10g of egg white and deionized water, mix and stir, the concentration of egg white is 20wt%, filter and remove the white floc in the egg white solution to obtain solution A;

[0025] According to the molar concentration of 0.1mol / L with FeSO 4 ·7H 2 O aqueous solution, after stirring for 30min, add ethylene glycol to the above solution, the volume ratio of ethylene glycol and deionized water is 1:3, stir for 10min, to obtain solution B;

[0026] Mix solution A and solution B, the volume ratio of solution A and solution B is 1~2; after stirring for 30 minutes, heat the solution to 50 °C under stirring, keep the solution for 8 hours and then lower the solution to room temperature, and put the obtained product at -80 ℃ freeze-drying; put the dried sample in a tube furnace, and heat-treat it in a high-purity nitrogen gas atmosphere. @Fe 2 o 3 composite nanomaterials.

[0027] The porous C@Fe synthesized in this example 2 o 3 The sensitivity to 1ppm acetone is 17...

Embodiment 3

[0029] Take 10g of egg white and deionized water, mix and stir, the concentration of egg white is 10wt%, filter and remove the white floc in the egg white solution, and obtain solution A;

[0030] According to the molar concentration of 0.2mol / L with FeSO 4 ·7H 2 O aqueous solution, after stirring for 30min, add ethylene glycol to the above solution, the volume ratio of ethylene glycol and deionized water is 1:2, stir for 10min, to obtain solution B;

[0031] Mix solution A and solution B, the volume ratio of solution A and solution B is 1~2; after stirring for 30 minutes, heat the solution to 50 °C under stirring, keep the solution for 8 hours and then lower the solution to room temperature, and put the obtained product at -80 ℃ freeze-drying; put the dried sample in a tube furnace, and heat-treat it in a high-purity nitrogen gas atmosphere. @Fe 2 o 3 composite nanomaterials.

[0032] The porous C@Fe synthesized in this example 2 o 3 The sensitivity to 1ppm acetone is ...

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Abstract

The invention discloses a preparation method of a c@ ferric oxide composite nanomaterial with a porous structure as well as a product and application of the c@ ferric oxide composite nanomaterial. Themethod comprises the following steps: by utilizing egg white as a biological template, growing alpha-FeOOH on the surface of the biological template; enabling the egg white to keep a biological structure thereof by utilizing a freeze-drying technology to dry; then carrying out high temperature treatment in an inert gas atmosphere, carbonizing the egg white and carrying out thermal decomposition on the alpha-FeOOH to obtain a c@alpha-Fe2O3 composite nanostructure. Components prepared from the c@alpha-Fe2O3 composite nanostructure can utilize the excellent electrical conductivity of the C material so as to enhance electrical properties of the components; the composite material can be applied to the fields of detection of toxic gases, supercapacitors and the like.

Description

technical field [0001] The invention relates to the technical field of gas-sensing materials, and specifically refers to a preparation method of a C@ferric oxide composite nanomaterial and its products and applications. Background technique [0002] Metal oxides such as Fe 2 o 3 , ZnO, SnO 2 、WO 3 Due to the advantages of excellent performance, environmental friendliness, abundant resources, and low price, it is a widely studied gas-sensing material. The gas-sensing performance of the material can be improved by metal oxide surface modification, metal / noble metal doping and other processes, and it has a very wide range of applications in the field of gas sensors. [0003] The key factors that determine the sensitivity of semiconductor gas-sensing materials include the reaction between the surface of the material and the gas to be measured and the conductivity of the material. The former determines the response sensitivity of the sensitive material, and the latter determi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12H01G11/24H01G11/30H01G11/44H01G11/46
CPCG01N27/127H01G11/24H01G11/30H01G11/44H01G11/46Y02E60/13
Inventor 何丹农葛美英徐磊尹桂林孙健武卢静张芳金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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