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Preparation method of nickel nanoparticle/graphene electromagnetic wave absorbing material

A nanoparticle and absorbing material technology, applied in the direction of magnetic/electric field shielding, electrical components, antennas, etc., to achieve impedance matching, solve easy agglomeration, and high-strength absorption.

Pending Publication Date: 2022-08-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The composite nano-electromagnetic wave absorbing material has relatively excellent electromagnetic wave absorption performance in the intermediate frequency band, but its maximum reflection loss can only reach -12dB【J.Mater.Chem.,2012,22,15190-15197】

Method used

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  • Preparation method of nickel nanoparticle/graphene electromagnetic wave absorbing material
  • Preparation method of nickel nanoparticle/graphene electromagnetic wave absorbing material
  • Preparation method of nickel nanoparticle/graphene electromagnetic wave absorbing material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] (1) Weigh 50 mg of graphene oxide powder into 100 mL of deionized water, and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a concentration of 0.5 g / L. 0.01mol of nickel sulfate pentahydrate was weighed, added to 100 mL of graphene oxide dispersion under magnetic stirring, and fully stirred for 30min to obtain a nickel sulfate / graphene oxide mixed solution containing a nickel ion concentration of 0.1mol / L.

[0041] (2) Weigh 0.03 mol of sodium borohydride and add it to 60 mL of deionized aqueous solution under magnetic stirring to obtain a sodium borohydride solution. Then, 40 mL of concentrated ammonia water was added to the sodium borohydride solution to obtain a uniformly dispersed ammonia water / sodium borohydride mixed solution, where the molar concentration of sodium borohydride was 0.3 mol / L. Wherein the molar mass ratio of nickel sulfate and sodium borohydride in step (1) and step (2) is 1:3, and the volume ratio of concentrated amm...

Embodiment 2

[0047] (1) Weigh 50 mg of graphene oxide powder into 100 mL of deionized water, and ultrasonically disperse for 60 min to obtain a graphene oxide dispersion with a concentration of 0.5 g / L. 0.01mol of nickel sulfate pentahydrate was weighed, added to 100 mL of graphene oxide dispersion under magnetic stirring, and fully stirred for 30min to obtain a nickel sulfate / graphene oxide mixed solution containing a nickel ion concentration of 0.1mol / L.

[0048] (2) Weigh 0.03 mol of sodium borohydride and add it to 60 mL of deionized aqueous solution under magnetic stirring to obtain a sodium borohydride solution. Then, 80 mL of concentrated ammonia water was added to the sodium borohydride solution to obtain a uniformly dispersed ammonia water / sodium borohydride mixed solution, where the molar concentration of sodium borohydride was 0.21 mol / L. . Wherein the molar mass ratio of nickel sulfate and sodium borohydride in step (1) and step (2) is 1:3, and the volume ratio of concentrated...

Embodiment 3

[0053] (1) Weigh 50 mg of graphene oxide powder into 100 mL of deionized water, and ultrasonically disperse for 60 min for 60 min to obtain a graphene oxide dispersion with a concentration of 0.5 g / L. 0.01mol of nickel sulfate pentahydrate was weighed, added to the graphene oxide dispersion under magnetic stirring, and fully stirred for 30min to obtain a graphene oxide mixed solution containing nickel ions.

[0054] (2) Weigh 0.01 mol of sodium borohydride and add it to 60 mL of deionized aqueous solution under magnetic stirring to obtain a sodium borohydride solution. Then, 40 mL of concentrated ammonia water was added to the sodium borohydride solution to obtain a uniformly dispersed ammonia water / sodium borohydride mixed solution. Wherein in step (1) and step (2), the molar mass ratio of nickel sulfate and sodium borohydride is 1:1, and the volume ratio of concentrated ammonia water and the prepared sodium borohydride solution is 4:3.

[0055] (3) the nickel sulfate / graphe...

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Abstract

The invention provides a preparation method of a nickel nanoparticle and graphene electromagnetic wave absorption composite material, and belongs to the technical field of electromagnetic wave absorption material preparation. According to the method, nickel sulfate is used as a nickel ion source, sodium borohydride is used as a reducing agent, stronger ammonia water is used as a precipitator, and graphene oxide is used as an attachment carrier. The nickel nanoparticle / graphene electromagnetic wave absorption composite material is synthesized by two steps of a controllable liquid drop method and heat treatment reduction. The electromagnetic wave absorption composite material is formed by tightly attaching and combining nickel nanoparticles and graphene, and formed graphene wrinkles effectively inhibit agglomeration of the nickel nanoparticles and promote dielectric magnetic synergistic loss of electromagnetic waves. The electromagnetic wave absorbing material has the characteristics of small density, small addition amount, simple preparation process and excellent wave absorbing performance, and can be widely applied to the fields of electromagnetic protection and microwave stealth as an electromagnetic shielding or loss material.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave absorption material preparation, in particular to a preparation method of a nickel nanoparticle / graphene electromagnetic wave absorption composite material. Background technique [0002] With the rapid progress and development of 5G information technology, the application of intelligent electronic equipment has become more extensive. Electronic equipment will continuously radiate electromagnetic waves to the outside world when working, resulting in electromagnetic leakage and electromagnetic interference and pollution. Studies have shown that long-term exposure to electromagnetic radiation can cause serious damage to human health, and the energy generated by electromagnetic radiation is transmitted to cells to cause abnormal body temperature and organ damage. In addition, electromagnetic radiation also increases the likelihood of genetic mutations and the incidence of teratoma and ca...

Claims

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Application Information

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IPC IPC(8): H05K9/00H01Q17/00
CPCH05K9/0081H05K9/0083H05K9/0001H01Q17/00
Inventor 张跃廖庆亮李琪荀晓晨赵璇赵斌徐良旭
Owner UNIV OF SCI & TECH BEIJING
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