Synthesis And Electromagnetic Wave Absorption Study Of Magnetic Nanoparticles @ Graphene

As the development of science and technology,like military information,aerospace,environmental protection,the electromagnetic?EM?wave absorption materials were received more and more attention,which were supposed to have an excellent comprehensive performance like highly efficient,broadband segment,lightweight,and thin thickness,etc.Graphene,a two-dimensional carbon material with honeycomb lattice structure and was tightly packed by the monolayer of carbon atoms through sp2 hybridization,possessed a series of advantages likes large surface area,low density and high conductivity,which made it possible to realize the comprehensive requirements for EM absorption materials of thin,width absorption band,light weight and strong absorption of EM wave to the continuous development of stealth technology.This paper was adopted one-step reaction technology,using the oxygen-containing function groups on the surface of grephene oxide to react with metal salts and introduced the magnetic nanocomponents,and completed the reduction of grephene oxide and the loaded magnetic nanocomponents in situ at the same time,and the reduced grephene oxide loaded three different kinds of magnetic components nanocomposites?rGO@Fe3O4,rGO@Co,rGO@Ni?were successfully achieved.Using X-ray diffraction analysis?XRD?,X-ray photoelectron spectroscopy?XPS?,scanning electron microscope?SEM?,transmission electron microscopy?TEM?and vibrating sample magnetmeter?VSM?and other analysis to study the nanocomposites'phase structure,surface chemical composition,microstructure morphology and its magnetic response.The influence of different mass ratio and different kinds of magnetic nanoparticles to the electromagnetic parameters of nanocomposites were tested by vector network analyzer,and used the software analyzes of matlab to analyze the change rule of absorption property and discussed the electromagnetic loss mechanism.The research results show that the grephene-magnetic nanocomposites were compounded the dielectric loss type of graphene and magnetic loss type of magnetic nanoparticles,and used multiple electromagnetic loss mechanism achieved excellent absorption performance.The Fe₃O₄@rGO nanocomposite present a RL_min value of-55.70 dB in 6.78 GHz and a 2.2GHz effective absorption band width?RL<-10 dB?with a thickness of 3.5 mm,and Co@rGO nanocomposite shows a RLmin value of-52.73 dB in 14.20 GHz and a 6.2 GHz effective absorption band width with thickness only 2.1 mm,and Ni@rGO nanocomposite exhibit a RLmin value of-53.92 dB in 9.50 GHz and a 3.41 GHz effective absorption band width with thickness only 2.8 mm.