摘要
In this work,hierarchical hybrid composites consisting of porous three-dimensional reduced graphene oxide(3D-rGO)skeleton and lamellar boron nitride(BN)/silicon carbide(SiC)coatings are prepared by chemical vapor infiltration(CVI)process.The graphene framework prepared by 3D printing and frozen self-assembly exhibits a lightweight structure and a perforated conductive network,which extends the transmission path of incident microwaves.The introduced ceramic coatings can effectively tune the impedance matching degree and supply a lossy phase,and the hierarchical structure of the composites enhances the multiple scattering of the incident microwaves.As expected,the 3D-rGO/BN/SiC composites possess an excellent absorbing performance with a minimum reflection loss value of–37.8 dB,and the widest effective absorbing bandwidth(RL<–10 dB)of 5.90 GHz is obtained.The controllable fabrication of composites can provide a guideline for rational design and fabrication of high-performance electromagnetic waves absorbing materials in practical applications.
基金
supported by the National Natural Science Foundation of China(No.51772310)
National Natural Science Foundation of China(No.52222202)
Chinese Academy of Sciences Key Research Program of Frontier Sciences(No.QYZDYSSWJSC031)
Key Deployment Projects of the Chinese Academy of Sciences(No.ZDRW-CN2019-01)
Shanghai Sailing Program(No.21YF1454600)
Outstanding Chinese and Foreign Youth Exchange Program of China Association of Science and Technology.
