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Metallic nickel/graphene composite wave-absorbing material and preparation method thereof

A graphene composite and wave absorbing material technology, applied in the field of wave absorbing materials, can solve the problems of complicated preparation process, long preparation time, narrow absorption frequency band, etc., and achieve the effect of obvious absorption intensity, simple preparation process and realization of preparation conditions

Inactive Publication Date: 2015-11-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method described in this document mainly has the following disadvantages: raw materials are expensive, equipment requirements are high, high temperature environment is required, argon gas is required for protection, the preparation cost is high, the prepared composite material has poor microwave absorption performance, and the maximum absorption strength is less than -15dB , narrow absorption band
This preparation method has the following disadvantages: surfactant needs to be added, high-temperature calcination is required, hydrogen reduction is required, the preparation time is long, the preparation process is complicated, time-consuming and energy-consuming

Method used

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  • Metallic nickel/graphene composite wave-absorbing material and preparation method thereof
  • Metallic nickel/graphene composite wave-absorbing material and preparation method thereof
  • Metallic nickel/graphene composite wave-absorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Graphite oxide by mass: nickel chloride hexahydrate=1:2.38, graphite oxide: ethylene glycol=1:1332 Weigh 0.05g graphite oxide and 0.1188g nickel chloride hexahydrate and disperse in 60mL ethylene glycol by ultrasonic 1h A mixed dispersion is formed. Sodium hydroxide by mass ratio: hydrazine hydrate=1:20 takes by weighing 0.5g sodium hydroxide and is dissolved in 10mL hydrazine hydrate (80wt%) to form mixed solution, mixed solution by mass ratio: dispersion liquid=1:6.34 this mixed solution is added into the above dispersion liquid, stirred magnetically for 10 minutes, poured it into a polytetrafluoroethylene-lined autoclave, placed it in a 200°C oven for 45 minutes, cooled it to room temperature and washed it several times with ethanol and deionized water. Dry in a vacuum drying oven to obtain the thorn ball-shaped metal nickel / graphene composite wave-absorbing material. From figure 1 It can be seen that the thorny ball-shaped metallic nickel of the present invention ...

Embodiment 2

[0024] Graphite oxide by mass: nickel chloride hexahydrate=1:4.79, graphite oxide: ethylene glycol=1:1332 Weigh 0.05g graphite oxide and 0.2377g nickel chloride hexahydrate and disperse in 60mL ethylene glycol by ultrasonic 1h A mixed dispersion is formed. Sodium hydroxide by mass ratio: hydrazine hydrate=1:24 takes by weighing 0.5g sodium hydroxide and is dissolved in 12mL hydrazine hydrate (80wt%) to form mixed solution, mixed solution by mass ratio: dispersion liquid=1:5.3 this mixed solution Add it to the above dispersion, stir it magnetically for 10 minutes, pour it into a polytetrafluoroethylene-lined autoclave, place it in an oven at 220°C for 30 minutes, cool it to room temperature and wash it with ethanol and deionized water for several times, and then the product obtained in Dry in a vacuum drying oven to obtain the thorn ball-shaped metal nickel / graphene composite wave-absorbing material.

Embodiment 3

[0026] Graphite oxide by mass: nickel chloride hexahydrate=1:1.19, graphite oxide: ethylene glycol=1:1332 Weigh 0.05g graphite oxide and 0.0594g nickel chloride hexahydrate and disperse in 60mL ethylene glycol by ultrasonic 1h A mixed dispersion is formed. Sodium hydroxide by mass: hydrazine hydrate=1:16 takes by weighing 0.5g sodium hydroxide and is dissolved in 8mL hydrazine hydrate (80wt%) to form mixed solution, by mass ratio mixed solution: dispersion liquid=1:7.8 this mixed solution Add it to the above dispersion, stir it magnetically for 10 minutes, pour it into a polytetrafluoroethylene-lined autoclave, place it in a 180°C oven for 1.5 hours, cool it to room temperature, wash it with ethanol and deionized water several times, and then the product Dry in a vacuum drying oven to obtain the thorn ball-shaped metallic nickel / graphene composite wave-absorbing material.

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Abstract

The invention discloses an aristate spherical metallic nickel / graphene composite wave-absorbing material and a preparation method thereof. The composite wave-absorbing material of graphene-loaded metallic nickel nanoparticles is prepared in one step through a hydrothermal reaction by adopting nickel chloride and graphite oxide as precursors and hydrazine hydrate as a reductant. The metallic nickel nanoparticles loaded on metallic nickel / graphene wave-absorbing material obtained by the preparation method are aristate spherical and are directly loaded on graphene, and are stable in structure and good in dispersibility; in addition, the preparation method is high in efficiency, low in cost, short in time consumption just needing 0.5-1.5 hours and simple in process. The prepared aristate spherical metal nickel / graphene wave-absorbing material has excellent wave-absorbing performance on 2-18GHz frequency bands.

Description

technical field [0001] The invention relates to a metal nickel / graphene composite wave-absorbing material and a preparation method thereof, belonging to the technical field of wave-absorbing materials. Background technique [0002] In recent years, with the rapid development and wide application of electromagnetic technology, more and more electromagnetic waves flood people's living space, and the problem of electromagnetic pollution has begun to attract widespread attention. At the same time, in order to meet the needs of modern warfare and increase the penetration capability of weapons, stealth technology has become one of the key military research projects of various military powers. As an urgent need of environmental science and military cutting-edge technology, electromagnetic wave absorbing materials can fundamentally solve the problems of electromagnetic shielding and electromagnetic stealth, so electromagnetic wave absorbing materials have become a research hotspot i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 姜炜刘功总孙丹萍王彦平
Owner NANJING UNIV OF SCI & TECH
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