Unlock instant, AI-driven research and patent intelligence for your innovation.

Graphene-loaded magnetic metal or oxide composite wave-absorbing material and preparation method thereof

A composite wave absorbing material, magnetic metal technology, applied in the fields of magnetic field/electric field shielding, electrical components, antennas, etc., can solve the problems of difficulty in regulating the loading of magnetic metals and their oxides, complex synthesis equipment, and high synthesis costs. Excellent absorption performance, high equipment requirements, and low synthesis cost

Pending Publication Date: 2021-01-01
JINZHONG UNIV
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, some researchers have achieved some results in the preparation of Fe, Co, Ni and other magnetic metals and their oxide nanoparticles / graphene composites, but the general process is complex, requiring complex synthesis equipment and chemical reagents, and the preparation cycle Long, high synthesis cost, difficult to control the loading of magnetic metals and their oxides, etc.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene-loaded magnetic metal or oxide composite wave-absorbing material and preparation method thereof
  • Graphene-loaded magnetic metal or oxide composite wave-absorbing material and preparation method thereof
  • Graphene-loaded magnetic metal or oxide composite wave-absorbing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A preparation method of graphene loaded Co composite wave-absorbing material, is characterized in that, its steps are as follows:

[0034] Step 1, graphene oxide supported cobalt nitrate

[0035] 200 mg of graphene oxide powder was added into 100 mL of high-purity water, and ultrasonically treated for 50 min to obtain a graphene oxide solution with a concentration of 2 mg / mL, and 0.1455 g of Co(NO 3 ) 2 ·6H 2 O was added to the graphene oxide solution, and after continuing to sonicate for 10 min, it was poured into an evaporating dish, at 60 o Drying at a temperature of C, that is, loading cobalt nitrate on graphene oxide.

[0036] Step 2, graphene loaded Co:

[0037] Put the product obtained in step 1 into a tube furnace, N 2 Under the protection of atmosphere at 600 o C calcined for 2 h, the heating rate was 2 o C / min, the graphene-loaded Co composite material was obtained, and the thermogravimetric analysis showed that the loading amount of Co nanoparticles wa...

Embodiment 2

[0040] A preparation method of graphene loaded Co composite wave-absorbing material, is characterized in that, its steps are as follows:

[0041] Step 1, graphene oxide supported cobalt nitrate

[0042] Add 200 mg of graphene oxide powder into 100 mL of high-purity water, and ultrasonicate for 50 min to obtain a graphene oxide solution with a concentration of 2 mg / mL. Add 0.291 g of Co(NO 3 ) 2 ·6H 2 O was added to the graphene oxide solution, and after continuing to sonicate for 10 min, it was poured into an evaporating dish, at 60 o Drying at a temperature of C, that is, loading cobalt nitrate on graphene oxide.

[0043] Step 2, graphene loaded Co:

[0044] Put the product obtained in step 1 into a tube furnace, N 2 Under the protection of atmosphere at 600 o C calcined for 2 h, the heating rate was 2 o C / min, the Co / graphene composite was obtained, and the thermogravimetric analysis showed that the loading of Co nanoparticles was 47.46 wt%.

[0045] Figure 3 is the SE...

Embodiment 3

[0049] A kind of preparation method of graphene loaded Co composite wave-absorbing material, the steps are as follows:

[0050] Step 1, graphene oxide supported cobalt nitrate

[0051] 200 mg of graphene oxide powder was added into 100 mL of high-purity water, and ultrasonically treated for 50 min to obtain a graphene oxide solution with a concentration of 2 mg / mL, and 0.582 g of Co(NO 3 ) 2 ·6H 2 O was added to the graphene oxide solution, and after continuing to sonicate for 10 min, it was poured into an evaporating dish, at 60 o Drying at a temperature of C, that is, loading cobalt nitrate on graphene oxide.

[0052] Step 2, graphene loaded Co:

[0053] Put the product obtained in step 1 into a tube furnace, N 2 Under the protection of atmosphere at 600 o C calcined for 2 h, the heating rate was 2 o C / min, the Co / graphene composite material was obtained, and the thermogravimetric analysis showed that the loading of Co nanoparticles was 60.49 wt%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Peak reflection lossaaaaaaaaaa
Peak reflection lossaaaaaaaaaa
Peak reflection lossaaaaaaaaaa
Login to View More

Abstract

The invention discloses a graphene-loaded magnetic metal or oxide composite wave-absorbing material and a preparation method thereof. Graphene oxide is used as a carbon source, nitrate of magnetic metal such as Fe, Co and Ni is impregnated and then calcined in a protective atmosphere, the magnetic metal or the oxide / graphene composite wave-absorbing material thereof is prepared through thermal decomposition and carbothermal reduction reaction, and the load capacity of the magnetic metal such as Fe, Co and Ni or the oxide of the magnetic metal is further regulated and controlled within a wide range. The preparation method disclosed by the invention adopts an impregnation method and a high-temperature roasting method, is simple in process, easy to operate and low in synthesis cost, does notneed complex synthesis equipment and chemical reagents, and is suitable for industrial production; the loading capacity of the magnetic metal or the oxide of the magnetic metal can be regulated and controlled in a wide range by controlling the process conditions; due to electromagnetic matching and electromagnetic loss of graphene and magnetic metal or oxide thereof, the microwave absorption performance of the composite material is excellent.

Description

technical field [0001] The invention relates to a composite wave-absorbing material with graphene loaded with magnetic metal or its oxide and a preparation method thereof, belonging to the technical field of microwave-absorbing materials. Background technique [0002] In recent years, the application of electromagnetic wave absorbing materials in radar detection, electromagnetic interference and electromagnetic pollution has attracted widespread attention. Although traditional microwave-absorbing materials such as magnetic metals, magnetic metal oxides, ferrites, alloys, etc. exhibit good microwave absorption properties, the high density and low conductivity of the materials limit their widespread use. Carbon materials can be used as dielectric absorbers due to their good chemical and thermal stability, excellent dielectric properties and low density, but their low magnetic permeability leads to impedance mismatch. As we all know, dielectric loss, magnetic loss and electrom...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H05K9/00H01Q17/00
CPCH05K9/0081H05K9/0083H01Q17/00
Inventor 李万喜
Owner JINZHONG UNIV