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Preparation method for reduced graphene oxide/Ni-Co ternary composite wave-absorbing material

A ternary composite and wave-absorbing material technology, applied in the field of wave-absorbing materials, can solve the problems of high production cost, expensive raw materials, narrow absorption frequency band, etc., and achieve the effect of simple preparation process, easy preparation conditions, and realization of preparation conditions

Inactive Publication Date: 2016-02-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
The composite material has an absorption peak at 11.9GHz when the thickness is 2mm, but the frequency band is narrow
This preparation method has the following disadvantages: surfactants need to be added, high-temperature oil baths are needed, argon gas needs to be used for protection, raw material prices are relatively expensive, energy consumption is large, and cost is high

Method used

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  • Preparation method for reduced graphene oxide/Ni-Co ternary composite wave-absorbing material
  • Preparation method for reduced graphene oxide/Ni-Co ternary composite wave-absorbing material
  • Preparation method for reduced graphene oxide/Ni-Co ternary composite wave-absorbing material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Graphite oxide by mass ratio: metal cobalt (Co 2+ ): metallic nickel (Ni 2+ )=1:0.197:0.391, graphite oxide: ethylene glycol=1:1332, take 0.05g graphite oxide, 0.0397g cobalt chloride hexahydrate and 0.0792g nickel chloride hexahydrate and disperse in 60mL ethylene glycol by ultrasonic 30min form a mixed dispersion. Sodium hydroxide by mass: hydrazine hydrate=1:16 takes by weighing 0.5g sodium hydroxide and is dissolved in 10g hydrazine hydrate solution (80wt%) to form mixed solution, is 10:1 to mix by the mass ratio of sodium hydroxide and graphite oxide The solution was mixed with the dispersion, stirred magnetically for 10 minutes, poured into a polytetrafluoroethylene-lined autoclave, and placed in a 160°C oven for 1 hour. After cooling to room temperature, it was washed several times with ethanol and deionized water. Dry in a vacuum oven to obtain the reduced graphene oxide / Ni-Co ternary composite wave-absorbing material. The XRD spectrogram of embodiment 1 prod...

Embodiment 2

[0025] Graphite oxide by mass ratio: metal cobalt (Co 2+ ): metallic nickel (Ni 2+ )=1:0.589:0.588, graphite oxide: ethylene glycol=1:1332, take 0.05g graphite oxide and 0.119g cobalt chloride hexahydrate and 0.119g nickel chloride hexahydrate and disperse in 60mL ethylene glycol by ultrasonic 30min form a mixed dispersion. Sodium hydroxide by mass: hydrazine hydrate=1:20 takes by weighing 0.5g sodium hydroxide and is dissolved in 12.5g hydrazine hydrate solution (80wt%) to form mixed solution, is 10:1 by the mass ratio of sodium hydroxide and graphite oxide Mix the mixed solution with the dispersion liquid, stir it magnetically for 10 minutes, pour it into a polytetrafluoroethylene-lined autoclave, place it in a 140°C oven for 2 hours, cool it to room temperature, wash it with ethanol and deionized water several times, and then obtain the product Dry in a vacuum oven to obtain the reduced graphene oxide / Ni-Co ternary composite wave-absorbing material. The XRD spectrum patt...

Embodiment 3

[0027] Graphite oxide by mass ratio: metal cobalt (Co 2+ ): metallic nickel (Ni 2+ )=1:1.57:0.782, graphite oxide: ethylene glycol=1:1332, weigh 0.05g graphite oxide, 0.3172g cobalt chloride hexahydrate and 0.1584g nickel chloride hexahydrate, disperse in 60mL ethylene dichloride by ultrasonic 30min Alcohol to form a mixed dispersion. Sodium hydroxide by mass: hydrazine hydrate=1:24 takes by weighing 0.5g sodium hydroxide and is dissolved in 15g hydrazine hydrate solution (80wt%) to form mixed solution, be 10:1 by the mass ratio of sodium hydroxide and graphite oxide The mixed solution was mixed with the dispersion liquid, stirred magnetically for 10 minutes, poured into a polytetrafluoroethylene-lined autoclave, placed in an oven at 120°C for 3 hours, cooled to room temperature and washed several times with ethanol and deionized water, and then the obtained product was Dry in a vacuum oven to obtain the reduced graphene oxide / Ni-Co ternary composite wave-absorbing material....

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Abstract

The invention discloses a preparation method for a reduced graphene oxide / Ni-Co ternary composite wave-absorbing material. According to the preparation method, graphite oxide, Co salt and Ni salt are adopted as precursors, hydrazine hydrate is adopted as a reducing agent, and the reduced graphene oxide / Ni-Co ternary composite wave-absorbing material can be prepared in one step of a hydrothermal reaction. Ni-Co binary alloy nanometer particles obtained during the preparation are directly loaded onto reduced graphene oxide (RGO) through in-situ growth, stable in structure, and high in dispersity; the preparation method is efficient, low in cost and short in consumed time; the prepared reduced graphene oxide / Ni-Co ternary composite wave-absorbing material is relatively good in performance; waves at different wavebands can be effectively absorbed by adjusting the addition proportions of graphite oxide, Co salt and Ni salt, the dosage of the reducing agent and the thickness of the reduced graphene oxide / Ni-Co ternary composite wave-absorbing material.

Description

technical field [0001] The invention relates to a preparation method of a reduced graphene oxide / Ni-Co ternary composite wave-absorbing material, belonging to the technical field of wave-absorbing materials. Background technique [0002] With the development of electronics and information technology and the popularization of electronic products, electromagnetic waves are widely present in people's daily life. If the electromagnetic radiation is too high, it will exceed the upper limit that the body and the environment can bear, forming electromagnetic pollution, which is regarded as the second water pollution. , noise pollution and the fourth largest source of pollution after air pollution, which is a serious hazard to health. The propagation of electromagnetic waves can also cause problems such as electromagnetic interference, so materials that can absorb electromagnetic waves of a certain frequency have broad application prospects in the civil field. In the military field...

Claims

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Application Information

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IPC IPC(8): C09K3/00
Inventor 姜炜刘功总钟素婷张娜王彦平孙丹萍
Owner NANJING UNIV OF SCI & TECH
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