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

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”.