A three-dimensional graphene sponge/fe 2 o 3 Composite wave-absorbing material and its preparation method

A composite wave-absorbing material and graphene sponge technology, applied in the field of wave-absorbing materials, can solve problems such as time-consuming, complicated operation, and high temperature of magnetic nanoparticles, and achieve the effects of broadening the application range, simple operating conditions, and high absorption strength

Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method solves the shortcomings of high temperature, time-consuming and complicated operation in the preparation of magnetic nanoparticles in the prior art. 2 o 3 Evenly loaded into the 3D graphene sponge structure, the two are tightly combined

Method used

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  • A three-dimensional graphene sponge/fe <sub>2</sub> o <sub>3</sub> Composite wave-absorbing material and its preparation method
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  • A three-dimensional graphene sponge/fe <sub>2</sub> o <sub>3</sub> Composite wave-absorbing material and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0030] Step 1: Add 1g of black nickel powder into 20ml of triethylene glycol solvent, and dropwise add 1ml of 1mol / L sodium hydroxide solution, pour it into a polyphenylene (PPL) lined stainless steel reaction kettle, put Put it into an oven, raise the temperature to 250°C, and react for 12 hours. After the reaction, it was naturally cooled to room temperature, and the product was washed several times with deionized water and absolute ethanol, and dried in vacuum to obtain a black powder. Then put the black powder into a ceramic ark, put it into a tube furnace, pass in an inert gas, and under the protection of an inert atmosphere, raise the temperature to 500°C at 5°C / min, keep it warm for 1h, and cool down to room temperature naturally. Finally, use dilute hydrochloric acid to dissolve the nickel nanoparticle core, wash with deionized water several times until PH = 7, and then freeze-dry to obtain a three-dimensional graphene sponge. Take a small amount of three-dimensional g...

Embodiment 2

[0035] Step 1: Add 2g of black nickel powder into 40ml of triethylene glycol solvent, and dropwise add 2ml of 1mol / L sodium hydroxide solution, pour it into a polyphenylene (PPL) lined stainless steel reaction kettle, put Put it into an oven, raise the temperature to 250°C, and react for 12 hours. After the reaction, it was naturally cooled to room temperature, and the product was washed several times with deionized water and absolute ethanol, and dried in vacuum to obtain a black powder. Then put the black powder into a ceramic ark, put it into a tube furnace, pass in an inert gas, and under the protection of an inert atmosphere, raise the temperature to 500°C at 8°C / min, keep it warm for 1h, and cool down to room temperature naturally. Finally, dilute hydrochloric acid was used to dissolve the nickel nanoparticle core, washed several times with deionized water until PH = 7, and then freeze-dried to obtain a three-dimensional graphene sponge. Take a small amount of three-dime...

Embodiment 3

[0040] Step 1: Add 3g of black nickel powder into 60ml of triethylene glycol solvent, and dropwise add 3ml of 1mol / L sodium hydroxide solution, pour it into a polyphenylene (PPL) lined stainless steel reaction kettle, put Put it into an oven, raise the temperature to 250°C, and react for 12 hours. After the reaction, it was naturally cooled to room temperature, and the product was washed several times with deionized water and absolute ethanol, and dried in vacuum to obtain a black powder. Then put the black powder into a ceramic ark, put it into a tube furnace, pass in an inert gas, and under the protection of an inert atmosphere, raise the temperature to 500°C at 10°C / min, keep it warm for 1h, and cool down to room temperature naturally. Finally, use dilute hydrochloric acid to dissolve the nickel nanoparticle core, wash with deionized water several times until PH = 7, and then freeze-dry to obtain a three-dimensional graphene sponge. Take a small amount of three-dimensional ...

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Abstract

A three-dimensional graphene sponge / Fe2O3 composite wave absorbing material and a preparation method thereof are disclosed and belong to the technical field of wave absorbing materials. Firstly, three-dimensional graphene is prepared through a template process and is then added into deionized water, the mixture is subjected to ultrasonic treatment to obtain a uniformly dispersed three-dimensionalgraphene sponge suspension, then an aqueous Fe<3+> solution is added into the suspension dropwise, and a reaction occurs at 70-95 DEG C after the pH value is adjusted with ammonia water. The structureand wave absorbing performance of the composite wave absorbing material are adjusted through controlling the using amount of FeCl3, the pH value, the reaction temperature and the reaction time. A graphene matrix of the composite wave absorbing material in which the graphene sponge is loaded with magnetic nanometer Fe2O3 particles has a mesoporous sponge structure, and the Fe2O3 particles are uniformly anchored and grow on the graphene sponge. The prepared composite wave absorbing material has characteristics of high wave absorbing intensity, effective absorption frequency bandwidth, low density, low thickness, and the like, and has important application value in the field of developing efficient and light-weight electromagnetic wave absorbing materials.

Description

technical field [0001] The invention belongs to the technical field of wave-absorbing materials, and relates to a three-dimensional graphene sponge / Fe 2 o 3 Composite wave-absorbing material and its preparation method. Background technique [0002] In recent years, with the rapid development of electronic equipment and communication facilities, serious electromagnetic radiation has become an important source of pollution, and electromagnetic pollution has become a problem that cannot be ignored. Electromagnetic radiation not only affects the normal operation of highly sensitive and sophisticated electronic equipment, but also has a significant negative effect on human health. Therefore, it is of great significance to develop ideal absorbing materials with characteristics such as strong absorption, wide frequency band, low density, and thin thickness. . [0003] Graphene is an ultra-thin two-dimensional carbon nanomaterial with a series of advantages such as small density,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00H05K9/00
CPCC09K3/00H05K9/0081
Inventor 陈平杨森于祺熊需海王静
Owner DALIAN UNIV OF TECH
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