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Method for preparing reduced graphene oxide/CoFe2O4/Ag composite wave-absorbing material

A composite wave-absorbing material, cofe2o4 technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as poor performance, complicated process, and harsh conditions of composite materials, and achieve good wave-absorbing performance, simple preparation process, The effect achieved by the preparation conditions

Inactive Publication Date: 2015-06-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the high temperature reduction method to prepare RGO / Fe 3 o 4 Composite materials have disadvantages such as harsh conditions, complicated process, and poor performance. This invention proposes a new type of RGO / CoFe 2 o 4 / Ag ternary composite absorbing material preparation method

Method used

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  • Method for preparing reduced graphene oxide/CoFe2O4/Ag composite wave-absorbing material
  • Method for preparing reduced graphene oxide/CoFe2O4/Ag composite wave-absorbing material
  • Method for preparing reduced graphene oxide/CoFe2O4/Ag composite wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Prepare a GO water solution with a concentration of 0.67 mg / ml, and prepare a 1 mol / L NaOH aqueous solution for later use;

[0022] 2. According to the mass ratio of GO:Co(NO 3 ) 2 ·6H 2 O:Fe(N0 3 ) 3 ·9H 2 O=1:1.24:3.42, weigh 124mg Co(NO 3 ) 2 · 6H 2 O and 342mgFe(NO 3 ) 3 ·9H 2 O, added to 150ml GO aqueous solution, after stirring for 30min, NaOH solution was added dropwise to adjust the pH of the mixture to 11;

[0023] 3. Add the above mixture into a hydrothermal kettle lined with polytetrafluoroethylene, and react at 180°C for 12 hours;

[0024] 4. The obtained precipitate was washed alternately with deionized water and absolute ethanol to pH=7, and the obtained RGO / CoFe 2 O 4 The precipitate was dispersed in 150ml of deionized water, according to the mass ratio of GO:AgNO 3 =1:0.63 Weigh 63mg AgNO 3 , added to the above mixture, stirred for 20min, according to the mass ratio of GO:NaBH 4 =1:5, weigh 500mgNaBH 4 Dissolved in 20ml of water, drop...

Embodiment 2

[0029] 1. Prepare a GO aqueous solution with a concentration of 0.67 mg / ml, and prepare a 1 mol / L NaOH aqueous solution for later use;

[0030] 2. According to the mass ratio of GO:Co(NO 3 ) 2 ·6H 2 O:Fe(NO 3 )3· 9 H 2 O=1:1.24:3.42, weigh 124mgCo (NO 3 ) 2 ·6H 2 O and 342mgFe(N0 3 )3 9H 2 O, added to 150ml GO aqueous solution, after stirring for 30min, NaOH solution was added dropwise to adjust the pH of the mixture to 11;

[0031] 3. Add the above mixture into a hydrothermal kettle lined with polytetrafluoroethylene, and react at 180°C for 12 hours;

[0032] 4. The obtained precipitate was washed alternately with deionized water and absolute ethanol to pH=7, and the obtained RGO / CoFe 2 O 4 The precipitate was dispersed in 150ml of deionized water, according to the mass ratio of GO:AgNO 3 =1:0.95 Weigh 95mg AgNO 3 , add the above mixed liquid, stir for 20min, according to the mass ratio GO:NaBH 4 =1:5, weigh 500mgNaBH 4 Dissolved in 20ml of water, dropped into...

Embodiment 3

[0036] 1. Prepare a GO aqueous solution with a concentration of 0.67 mg / ml, and prepare a 1 mol / L NaOH aqueous solution for later use;

[0037] 2. According to the mass ratio of GO:Co(NO 3 ) 2 ·6H 2 O:Fe(NO 3 ) 3 ·9H 2 O=1:1.24:3.42, weigh 124mg Co(NO 3 ) 2 ·6H 2 O and 342 mg Fe(NO 3 ) 3 ·9H 2 O, added to 150ml of GO aqueous solution, after stirring for 30min, dropwise added NaOH solution to adjust the pH of the mixture to 11;

[0038] 3. Add the above mixed solution to a hydrothermal kettle lined with polytetrafluoroethylene, and react at 180°C for 12h;

[0039] 4. The obtained precipitate was washed alternately with deionized water and absolute ethanol to pH=7, and the obtained RGO / CoFe 2 O 4 The precipitate was dispersed in 150ml of deionized water, according to the mass ratio of GO:AgNO 3 =1:1.26 Weigh 126mg AgNO 3 , added to the above mixture, stirred for 20min, according to the mass ratio of GO:NaBH 4 =1:5, weigh 500mg NaBH 4 Dissolved in 20ml of water, ...

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Abstract

The invention provides a method for preparing a reduced graphene oxide / CoFe2O4 / Ag composite wave-absorbing material. According to the method, RGO / CoFe2O4 is prepared by use of a hydrothermal method, and then the RGO / CoFe2O4 / Ag ternary composite wave-absorbing material is prepared by use of a wet chemical method. The method is characterized in that no any surfactant is needed and also no insert gas such as nitrogen is needed for protection; the preparation process is simple and the preparation conditions are easy to implement.

Description

technical field [0001] The invention relates to a method for preparing a ternary composite microwave absorbing material. Background technique [0002] Ferrite has the advantages of high absorbing efficiency, wide frequency band and low cost. It is the earliest practical and most commonly used electromagnetic wave absorber. Foreign researchers are trying to develop new ferrite materials. One of the important directions is to obtain excellent absorbing materials through compounding. Graphene is a carbonaceous material with a single-layer structure formed by the close packing of carbon atoms. It has excellent performance. Its two-dimensional sheet structure is conducive to the absorption of electromagnetic waves. Using graphene as the matrix to load ferrite, a composite absorbing material with light weight and wide absorbing frequency can be obtained. The copper group metal Ag is an excellent conductive material. Under the action of electromagnetic waves, the surface field is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
Inventor 黄英宗蒙张娜曲春昊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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