Design Of Carbon/Fe_xO_y Composite Absorber And Study On Their Mechanism

The wide application of electromagnetic waves has transformed the production and lifestyle of human beings,but at the same time,it has also brought many negative effects.Therefore,the development of excellent absorbing materials is urgent.In recent years,carbon materials have been widely used in the field of electromagnetic wave absorption.However,the impedance matching performance of pure carbon materials is poor,and the wave absorption effect is still not ideal.Therefore,it is necessary to develop composite materials based on carbon materials.Among them,graphite nanosheets have been selected as one of the carbon materials because of their low density and good wave absorption properties.In addition,they have been selected as the second carbon material due to their reproducibility and low density.In this paper,carbon material is mainly used as a matrix,and it is combined with ferrite Fe_xO_y?a-Fe₂O₃,Fe₃O₄,Fe?and silicon carbide?SiC?through a simple and easy method to prepare a new type of absorbing material with excellent performance,and explore its absorbing performance and absorbing principle,the main research contents are as follows:Fe_xO_y Decorated Graphite Nanosheets are synthesized by a facile coprecipitation method followed by heat treatment under different conditions.The obtained Fe_xO_y Decorated Graphite Nanosheets exhibits excellent electromagnetic wave absorption when compared with conventional graphite/magnetic-particles composites.The minimum reflection loss?RL?can reach-42.1 d B at 4.16 GHz in absorbent/paraffin composites.The bandwidth of the RL below-10 d B covers 4.4 GHz?11.04-15.44 GHz?with a thickness of 2 mm.In order to explore the application prospects of bio-carbon materials in the field of wave absorption,bio-carbon/Fe_xO_y composite wave-absorbing materials were prepared by using cotton fiber,jute fiber,bamboo fiber and corn leaves as bio-carbon sources,and still using co-precipitation followed by heat treatment.The minimum reflection loss of the prepared Corn Leaf/Fe reaches-41.1 d B at 14.56 GHz,and the effective absorption bandwidth reaches 5.04 GHz?12.48-17.52 GHz?,showing excellent absorption performance.This provide ideas for the design and development of bio-carbon electromagnetic wave absorption materials.Inspired by the preparation of Fe_xO_y Decorated Graphite Nanosheets,SiC/Fe_xO_y Decorated Graphite Nanosheets were prepared by simple co-precipitation followed by heat treatment and then compounded with SiC.The introduction of SiC adjusts the electromagnetic parameters of the composite material,improves its impedance matching performance,and greatly broadens the absorption band of the composite material.The minimum reflection loss of the absorbent/paraffin composite material reaches-41.8 d B at 14 GHz,and the effective absorption bandwidth reaches 6.56 GHz?11.28-17.84 GHz?only at a thickness of 2 mm.The principle of the reaction process and the mechanism of wave absorption are explored in detail.