Inimitable 3D pyrolytic branched hollow architecture with multi-scale conductive network for microwave absorption  

作　　者：Jiajun Li Qianqian Zhu Jiahui Zhu Yuhang Cheng Zirui Jia Feng Lu Chao Wang Guanglei Wu 

机构地区：[1]Institute of Materials for Energy and Environment,State Key Laboratory of Bio-fibers and Eco-textiles,College of Materials Science and Engineering,Qingdao University,Qingdao,266071,China [2]College of Chemistry and Chemical Engineering,Qingdao University,Qingdao,266071,China [3]Technical Center of Qingdao Customs,Qingdao,266002,China

出　　处：《Journal of Materials Science & Technology》2024年第6期170-180,共11页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52377026,N52301192,No.52002196);Natural Science Foundation of Shandong Province(Nos.ZR2019YQ24,No.ZR2020QF084);Taishan Scholars and Young Experts Program of Shandong Province(No.tsqn202103057);the Qingchuang Talents Induction Program of Shandong Higher Education Institution(Research and Innovation Team of Structural-Functional Polymer Composites);Special Financial of Shandong Province(Structural Design of High-efficiency Electromagnetic Wave-absorbing Composite Materials and Construction of Shandong Provincial Talent Teams(No.37000022P990304116449)).

摘　　要：To solve the electromagnetic pollution problem,the reasonable structure design and component control of the electromagnetic absorber is prominent.In this work,three-dimensional(3D)pyrolytic branched hollow architecture carbon PBHAC/MoS_(2)composites were prepared via a hydrothermal and calcination two-step strategy.The narrow-gap nano-size MoS_(2)acquired after vulcanization and micro-size 3D branched carbon skeleton PBHAC possess intensified conduction losses.Particularly,the presence of potential differences between different phases creates a space charge region at the heterogeneous interface,resulting in strong interfacial polarization.The resulting 3D branched hollow PBHAC/MoS_(2)composites exhibit optimized impedance matching and multiple loss mechanisms.Finally,the 3D branched hollow carbon PBHAC/MoS_(2)composites have the best electromagnetic wave(EMW)absorption performance.The minimum reflection loss(RLmin)is-57.8 dB at 1.93 mm and the maximum effective absorption bandwidth(EAB_(max))is 6.08 GHz at 2 mm,which indicates the excellent EMW absorption performance of the composites.Accordingly,this composite is expected to be a microwave absorber with the characteristics of“thin,light,wide,and strong”.

关 键 词：Dielectric loss MoS_(2) Impedance matching Schottky barrier Microwave absorption 

分 类 号：TQ174[化学工程—陶瓷工业]