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Method for preparing reduced-oxidized graphene/Fe3O4/Ag nano composite wave-absorbing material

A nano-composite and wave-absorbing material technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of harsh preparation conditions, difficult large-scale production, and complicated processes of composite materials, and achieve good wave-absorbing performance and wave-absorbing properties. The effect of wide frequency band and simple preparation process

Active Publication Date: 2013-09-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to avoid the deficiencies of the prior art, the present invention proposes a reduced graphene oxide / Fe 3 o 4 / Ag nanocomposite wave-absorbing material preparation method, overcome the high temperature reduction method to prepare RGO-Fe 3 o 4 The preparation conditions of composite materials are harsh, the process is complicated, the time is long, it is difficult to produce on a large scale, and the performance is not good.

Method used

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  • Method for preparing reduced-oxidized graphene/Fe3O4/Ag nano composite wave-absorbing material
  • Method for preparing reduced-oxidized graphene/Fe3O4/Ag nano composite wave-absorbing material
  • Method for preparing reduced-oxidized graphene/Fe3O4/Ag nano composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Prepare a GO aqueous solution with a concentration of 0.5mg / ml, and a 1mol / L NaOH aqueous solution for later use;

[0028] 2. According to the mass ratio of GO:FeCl 2 4H 2 O:FeCl 3 ·6H 2 O=1:2.58:3.52 weigh 258mg FeCl 2 4H 2 O and 352 mg FeCl 3 ·6H 2 O, added to 200ml GO aqueous solution, heated in a water bath to 50°C for 10min, added NaOH solution dropwise to adjust the pH of the mixture to 11, and heated the mixture at 70°C for 3h;

[0029] 3. Wash the obtained black precipitate with deionized water for 3-5 times by centrifugal washing method, and then dissolve it in 200ml deionized water. According to the mass ratio of GO:AgNO 3 =1:0.79, weigh 79mg AgNO 3 Dissolve in the above mixture, stir for 20min, according to the mass ratio GO:NaBH 4 =1:10 Weigh 1g NaBH 4 Dissolve in 50ml of water, drop into the mixture, heat at 80°C for 2h;

[0030] 4. Use deionized water and absolute ethanol to wash alternately until pH = 7, use magnetic separation to obtain a b...

Embodiment 2

[0033] 1. Prepare a GO aqueous solution with a concentration of 0.5mg / ml, and a 1mol / L NaOH aqueous solution for later use;

[0034] 2. According to the mass ratio of GO:FeCl 2 4H 2 O:FeCl 3 ·6H 2 O=1:2.58:3.52 weigh 258mg FeCl 2 4H 2 O and 352 mg FeCl 3 ·6H 2 O, added to 200ml GO aqueous solution, heated in a water bath to 50°C for 10min, added NaOH solution dropwise to adjust the pH of the mixture to 11, and heated the mixture at 70°C for 3h;

[0035] 3. Wash the obtained black precipitate with deionized water for 3-5 times by centrifugal washing method, and then dissolve it in 200ml deionized water. According to the mass ratio of GO:AgNO 3 =1:1.58, weigh 158mg AgNO 3 Dissolve in the above mixture, stir for 20min, according to the mass ratio GO:NaBH 4 =1:10 Weigh 1g NaBH 4 Dissolve in 50ml of water, drop into the mixture, heat at 80°C for 2h;

[0036] 4. Use deionized water and absolute ethanol to wash alternately until pH = 7, use magnetic separation to obtain a ...

Embodiment 3

[0040] 1. Prepare a GO aqueous solution with a concentration of 0.5mg / ml, and a 1mol / L NaOH aqueous solution for later use;

[0041] 2. According to the mass ratio of GO:FeCl 2 4H 2 O:FeCl 3 ·6H 2 O=1:2.58:3.52 weigh 258mg FeCl 2 4H 2 O and 352 mg FeCl 3 ·6H 2 O, added to 200ml GO aqueous solution, heated in a water bath to 50°C for 10min, added NaOH solution dropwise to adjust the pH of the mixture to 11, and heated the mixture at 70°C for 3h;

[0042] 3. Wash the obtained black precipitate with deionized water for 3-5 times by centrifugal washing method, and then dissolve it in 200ml deionized water. According to the mass ratio of GO:AgNO 3 =1:3.15, weigh 315mg AgNO 3 Dissolve in the above mixture, stir for 20min, according to the mass ratio GO:NaBH 4 =1:10 Weigh 1g NaBH 4 Dissolve in 50ml of water, drop into the mixture, heat at 80°C for 2h;

[0043] 4. Use deionized water and absolute ethanol to wash alternately until pH = 7, use magnetic separation to obtain a ...

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Abstract

The invention relates to a method for preparing a reduced-oxidized graphene / Fe3O4 / Ag nano composite wave-absorbing material. The method comprises the following steps: preparing GO / Fe3O4 by using a simplified coprecipitation method, and preparing the RGO / Fe3O4 / Ag ternary composite material by employing a wet chemical reducing method. The preparation method is simple and rapid, large-scale production can be realized, the prepared composite material is good in wave-absorbing performance, and different wave bands can be effectively absorbed by adjusting the ratio of RGO to Fe3O4 to Ag, the amount of the reducing agent and the thickness of the composite material.

Description

technical field [0001] The invention belongs to a preparation method of a ternary composite microwave absorbing material, in particular to a reduced graphene oxide / Fe 3 o 4 / Ag nanocomposite wave-absorbing material preparation method. Background technique [0002] Ferrite has the advantages of high absorption efficiency, wide frequency band, and low cost. It is the earliest practical and most commonly used electromagnetic wave absorber. However, its wide application is limited due to its shortcomings such as excessive density and poor high-temperature performance. In recent years, many researchers at home and abroad have attempted to obtain microwave-absorbing materials with low density and excellent performance by combining ferrite and carbon-based materials. Graphene is a carbonaceous material with a single-layer structure formed by densely packed carbon atoms. It has excellent performance. Its two-dimensional sheet structure is conducive to the absorption of electromagn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 黄英宗蒙曲春昊罗迪迪王慎强张娜郑江波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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