Preparation And Electromagnetic Absorption Properties Of Ni/graphene Composites

In this dissertation,magnetic materials,conducive polymer materials and graphene were researched on the field of electromagnetic?EM?wave absorber.The composites of polypyrrole/nickel/reduced graphene oxide?PPy/Ni/RGO?,nickel/polypyrrole/reduced graphene oxide?Ni/PPy/RGO?and ferronickel/reduced graphene oxide?FeNi/RGO?were prepared.Through changing the original reagent addition,we can explore the concentration's influences on EM wave absorption properties.?1?Firstly,the binary composite Ni/RGO and hollow tubular PPy were prepared and then the combination of them was through the way of mechanically stirring at room temperature.Through regulating the mass ratio of PPy,we seek out the optimal proportions of raw ingredients to realize excellent EM wave absorption performance of the composites.The PNR-3 sample's reflection loss?RL?value is-18.21 dB at 15.92 GHz with the thickness of 1.5 mm,and the effective absorption bandwidth is 4.32 GHz located at 13.68 GHz¹8 GHz.?2?Secondly,the binary composite PPy/GO was prepared,and then Ni²⁺and GO were reduced to form the ternary compssite Ni/PPy/RGO.Through changing the mass ration of PPy/GO,we found its influence on EM wave absorption performance of Ni/PPy/RGO.The lowest RL value of NPR-3 at 2.8 GHz reached-44 dB with the thickness of 5.5 mm.?3?FeNi/RGO composites were synthesized via a one-step solvothermal in-situ reduction method.Keeping the Fe and Ni element's amount proportion of substance unchanged,the mass ratios of FeNi alloy in FR samples were adjusting by the initial concentration of iron salt and nickel salt.The RL value of FR-1 sample can achieve-35.16 dB at 9.84 GHz with relatively thinner thickness of 2 mm.Its effective absorption bandwidth can reach 2.48 GHz?8.72GHz¹1.2 GHz?.