US 11,866,335 B2
Method for preparing graphene based composite wave-absorbing composite material
Heping Zeng, Chongqing (CN); Yanwei Huang, Chongqing (CN); and Jiayang He, Chongqing (CN)
Assigned to CHONGQING INSTITUTE OF EAST CHINA NORMAL UNIVERSITY, Chongqing (CN); and EAST CHINA NORMAL UNIVERSITY, Shanghai (CN)
Filed by Chongqing Institute of East China Normal University, Chongqing (CN); and East China Normal University, Shanghai (CN)
Filed on Jul. 14, 2020, as Appl. No. 16/928,459.
Claims priority of application No. 201910697434.4 (CN), filed on Jul. 30, 2019.
Prior Publication US 2021/0032111 A1, Feb. 4, 2021
Int. Cl. C01B 32/198 (2017.01); C01B 32/194 (2017.01); B01J 13/00 (2006.01); B05D 1/00 (2006.01); B05D 3/06 (2006.01)
CPC C01B 32/198 (2017.08) [B01J 13/0008 (2013.01); B05D 1/005 (2013.01); B05D 3/066 (2013.01); C01B 32/194 (2017.08); B05D 2202/25 (2013.01); C01P 2006/90 (2013.01)] 11 Claims
OG exemplary drawing
 
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 BaFe12O19 and graphene.