Preparation And Investigation Of The Microwave Absortion Properties Of Reduced Graphene Oxide-based Composite

With the application and popularization of anti-detection technology in the military field and the aggravation of the harm of electromagnetic pollution to human health,people have to turn their eyes to electromagnetic wave absorbing materials.Therefore,it is urgent to develop a new type of electromagnetic wave absorbing material with thin thickness,light weight,wide absorption frequency band and strong absorption performance.In this paper,the reduced graphene oxide material is used as the matrix to carry out research,and the main research results are as follows:1.RGO/MnFe₂O₄ was prepared by one-step hydrothermal method.The mass ratio between RGO and MnFe₂O₄ and the effect of the filling ratio of RGO/MnFe₂O₄ on its microwave absorption performance were studied.The results show that when the filling ratio is 70 wt%,RGO/MnFe₂O₄?S2?has the best microwave absorption performance,RL_min=-47.5 dB,and the effective absorption bandwidth at the thickness of 1.7 mm is 5.2GHz?RL<-10 dB?.2.RGO/ZnFe₂O₄ was prepared by a simple two-step hydrothermal-solvothermal method.The effect of filling ratio on microwave absorption performance of RGO/ZnFe₂O₄was studied by adjusting the mass ratio of product RGO/ZnFe₂O₄ and solid paraffin.Compared with mixed RGO/ZnFe₂O₄,the product RGO/ZnFe₂O₄ obtained by solvothermal recombination has better microwave absorption performance.When the filling ratio of RGO/ZnFe₂O₄ is 75 wt%,RL_min=-41.1 dB,and the effective absorption bandwidth at the thickness of 2 mm is 3.2 GHz?RL<-10 dB?.3.RGO/ZnFe₂O₄/MWCNTs were prepared by a two-step hydrothermal-solvothermal method.Glucose was used as reducing agent to reduce GO in hydrothermal process to obtain RGO,and RGO/ZnFe₂O₄/MWCNTs were prepared by solvothermal method.The effects of the structure,morphology,magnetic properties and filling ratio of the samples on their microwave absorption properties were studied.Compared with pure ZnFe₂O₄ particles,RGO/ZnFe₂O₄/MWCNTs has better microwave absorption performance.When the filling ratio is 50 wt%,RL_min=-22.2 dB,and the effective absorption bandwidth at the thickness of 1 mm is 2.3 GHz?RL<-10 dB?.4.Nitrogen-doped reduced graphene oxide hydrogel was prepared by one-step hydrothermal method with different amounts of ethylenediamine?as reducing agent and nitrogen-doped agent?.Nitrogen-doped reduced graphene oxide aerogel was obtained by freeze drying.The effect of nitrogen doping amount on microwave absorption performance of nitrogen-doped reduced graphene oxide aerogel was studied.The results show that nitrogen doped reduced graphene oxide aerogel?N/C content percentage is 11.3,filling ratio is 6 wt%?has the best microwave absorption performance,RL_min=-67.3 dB,and the effective absorption bandwidth at the thickness of 4.65 mm is 3.12 GHz?RL<-10 dB?.Figure 41 table 9 reference 127...