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Preparation method of graphene-supported iron oxide nanoparticle composite wave-absorbing agent

A technology of ferric oxide and nanoparticles, which is applied in the field of wave absorbing materials, can solve the problems of difficulty in uniform distribution of graphene, easy agglomeration of ferric oxide nanoparticles, and difficult control of product purity, and achieves uniform distribution and good absorption. Wave properties, the effect of simple preparation process

Inactive Publication Date: 2018-03-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the synthesis methods of graphene / Fe3O4 composite materials are mainly co-precipitation, hydrothermal and solvothermal methods, and the preparation of Fe3O4 nanoparticles by the co-precipitation method is easy to agglomerate, and it is difficult to achieve Uniform distribution; hydrothermal method and solvothermal method have too many process parameters, and the product purity is not easy to control; and these methods are difficult to achieve mass production of absorbing materials

Method used

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  • Preparation method of graphene-supported iron oxide nanoparticle composite wave-absorbing agent
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  • Preparation method of graphene-supported iron oxide nanoparticle composite wave-absorbing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh 3.592g of ferric nitrate nonahydrate, 4g of anhydrous glucose, and 26g of sodium chloride, dissolve the mixture in 300ml of deionized water and stir magnetically for 4 hours to obtain a uniform mixed solution. The resulting solution is processed by a spray dryer to obtain a composite material precursor powder. Take 10g of precursor powder and place it in the ark, put the ark into the constant temperature zone of the tube furnace, pass through 400ml / min Ar for 20min to exhaust the air, then use 100ml / min Ar as the protective atmosphere, and raise the temperature at a heating rate of 10℃ / min Heat at 700°C for 2 hours to carbonize glucose and reduce ferric nitrate. After the reaction, cool to room temperature under the protection of Ar atmosphere to obtain the first-step calcined product. Put the calcined product of the first step into a tube furnace, use 400ml / min air as the calcining atmosphere, and raise the temperature to 250°C at a heating rate of 5°C / min, keep ...

Embodiment 2

[0026] Weigh 2.694g of ferric nitrate nonahydrate, 4g of anhydrous glucose, and 26g of sodium chloride, dissolve the mixture in 300ml of deionized water and stir it magnetically for 4 hours to obtain a uniform mixed solution. The resulting solution is processed by a spray dryer to obtain a composite material precursor powder. Take 10g of precursor powder and place it in the ark, put the ark into the constant temperature zone of the tube furnace, pass through 400ml / min Ar for 20min to exhaust the air, then use 100ml / min Ar as the protective atmosphere, and raise the temperature at a heating rate of 10℃ / min Heat at 700°C for 2 hours to carbonize glucose and reduce ferric nitrate. After the reaction, cool to room temperature under the protection of Ar atmosphere to obtain the first-step calcined product. Put the calcined product of the first step into a tube furnace, use 400ml / min air as the calcining atmosphere, and raise the temperature to 250°C at a heating rate of 5°C / min, ke...

Embodiment 3

[0028] Weigh 1.796g of ferric nitrate nonahydrate, 4g of anhydrous glucose, and 26g of sodium chloride, dissolve the mixture in 300ml of deionized water and stir it magnetically for 4 hours to obtain a uniform mixed solution. The resulting solution is processed by a spray dryer to obtain a composite material precursor powder. Take 10g of precursor powder and place it in the ark, put the ark into the constant temperature zone of the tube furnace, pass through 400ml / min Ar for 20min to exhaust the air, then use 100ml / min Ar as the protective atmosphere, and raise the temperature at a heating rate of 10℃ / min Heat at 700°C for 2 hours to carbonize glucose and reduce ferric nitrate. After the reaction, cool to room temperature under the protection of Ar atmosphere to obtain the first-step calcined product. Put the calcined product of the first step into a tube furnace, use 400ml / min air as the calcining atmosphere, and raise the temperature to 250°C at a heating rate of 5°C / min, ke...

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Abstract

The invention relates to a preparation method of a graphene-supported iron oxide nanoparticle composite wave-absorbing agent, comprising: (1) preparing composite precursor powder by a spray process, to be specific, using iron nitrate nonahydrate as an iron source, anhydrous glucose as a carbon source and sodium chloride as a template with a molar ratio of Fe, C and NaCl being (0.75-2):30:100, dissolving the iron source, the carbon source and the sodium chloride in deionized water, magnetically stirring to obtain aa homogenous mixed solution, and subjecting the solution mixed well to spray drying to obtain precursor powder; reducing the composite precursor powder by calcining; oxidizing the composite precursor powder by calcining; removing the NaCl template. The graphene-supported iron oxide nanoparticle composite prepared by using the preparation method is applied to electromagnetic wave absorption.

Description

technical field [0001] The invention relates to a preparation method of a graphene-loaded ferric oxide nanoparticle composite material used for electromagnetic wave absorption, and belongs to the field of wave-absorbing materials. Background technique [0002] Nowadays, with the continuous development of electronic technology, more and more communication equipment and electronic equipment bring convenience to our life, but also induce some problems. Electromagnetic wave pollution has become another serious threat besides water pollution, air pollution, and noise pollution. There are three main hazards: ① Electromagnetic waves will cause varying degrees of harm to human health; ② Electromagnetic waves will interfere with other electronics The normal operation of the equipment; ③The leakage of electromagnetic information will pose a great threat to the information security of individuals, enterprises and even the country. Therefore, many countries have invested a lot of manpo...

Claims

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Application Information

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IPC IPC(8): C09K3/00B82Y30/00
CPCB82Y30/00C09K3/00
Inventor 师春生刘振楠赵乃勤刘恩佐何春年何芳马丽颖李群英
Owner TIANJIN UNIV
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