Method for preparing graphene based composite wave-absorbing composite material

Patent metadata

Field	Value
Publication number	US-11866335-B2
Application number	US-202016928459-A
Country	US
Kind code	B2
Filing date	Jul 14, 2020
Priority date	Jul 30, 2019
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A method for preparing a graphene based composite wave-absorbing material includes: dissolving a water soluble barium salt and a water soluble iron salt into deionized water, respectively; mixing barium salt solution and iron salt solution according to a molar ratio of Ba:Fe of 1:12 to obtain a precursor solution; dispersing a graphene material in deionized water to form a graphene dispersion; adding citric acid, nitric acid and the graphene dispersion into the precursor solution in sequence to form a mixture solution; stirring the mixture solution at a temperature of 50 to 75° C. to obtain a sol; coating and drying aged sol on a substrate to obtain a coating layer; and sintering the coating layer by a laser irradiation.

First claim

What is claimed is:

1. A method for preparing a graphene based composite wave-absorbing material, comprising:
dissolving a water soluble barium salt and a water soluble iron salt into deionized water to form a barium salt solution and an iron salt solution, respectively;
mixing the barium salt solution and the iron salt solution according to a molar ratio of Ba:Fe of 1:12 to obtain a precursor solution having a metallic ion concentration in a range of 0.1 to 1.0 mol/L;
dispersing a graphene material in deionized water to form a graphene dispersion having a concentration of 0.1 to 0.9 mg/mL;
adding citric acid, nitric acid and the graphene dispersion into the precursor solution in sequence to form a mixture solution;
stirring the mixture solution at a temperature of 50 to 75° C. to obtain a sol;
aging the sol for 18 to 42 h;
coating the sol on a substrate and drying the sol at a temperature of 60 to 100° C. to obtain a coating layer; and
sintering the coating layer by a laser irradiation having a laser power ranging from 90 to 200 W and an irradiation period of 3 s to 20 s to obtain the graphene based composite wave-absorbing material comprising a compound of a formula of BaFe 12 O 19 and graphene.

2. The method according to claim 1 , wherein before the coating layer is sintered by the laser irradiation, the coating layer is irradiated by laser at a laser power ranging from 1 to 40 W for a period of 10 s to 15 min.

3. The method according to claim 1 , wherein the water soluble iron salt comprises ferric chloride and ferrous chloride.

4. The method according to claim 1 , wherein the water soluble barium salt comprises barium chloride.

5. The method according to claim 1 , wherein the graphene material comprises graphene oxide and graphene quantum dot.

6. The method according to claim 5 , wherein the graphene oxide is prepared via a Hummers method or an ultrasonic-assisted Hummers method.

7. The method according to claim 5 , wherein the graphene quantum dot is prepared via a hydrothermal method.

8. The method according to claim 5 , wherein the coating is performed via a Czochralski method, a spin-coating method or a casting method.

9. The method according to claim 1 , wherein citric acid of 0.1 to 0.4 g/ml is added into the precursor solution.

10. The method according to claim 1 , wherein nitric acid is a dilute nitric acid solution with a concentration of 0.3 mol/L to adjust a pH of the mixture solution in a range of 3 to 7.

11. The method according to claim 1 , wherein nitric acid is a dilute nitric acid solution with a concentration of 0.3 mol/L to adjust a pH of the mixture solution in a range of 3 to 5.

Assignees

• Chongqing Institute Of East China Normal Univ
• Univ East China Normal

Inventors

• Zeng Heping
• Huang Yanwei
• He Jiayang

Classifications

• C01B32/198 Primary

  Graphene oxide · CPC title

• B01J13/0008

  Sols of inorganic materials in water · CPC title

• B05D1/005

  Spin coating · CPC title

• B05D3/066

  involving also the use of a gas · CPC title

• C01B32/194 Primary

  After-treatment · CPC title