Simultaneous manipulation of polarization relaxation and conductivity toward self-repairing reduced graphene oxide based ternary hybrids for efficient electromagnetic wave absorption

In consideration of the growing electromagnetic wave (EMW) pollution and interference, it is of crucial and imperative significance to develop high-efficiency EMW absorption materials. Herein, hierarchical hybrid network of MoS2@poly (3, 4-ethylenedioxythiophene) (PEDOT)/reduced graphene oxide (rGO) were successfully constructed and fabricated through the combination of oxidative polymerization and microwave-irradiated thermal reduction. The original defects in graphene oxide (GO) could be in situ repaired by introducing carbon source, and the rational regulation of polarization relaxation and conduc-tivity of composites could be achieved. Profiting from the good impedance matching, ameliorated con-ductivity and enhanced dipole polarization as well as interfacial polarization by introducing GO/ defect-recovered rGO and conductive PEDOT, both the MoS2@PEDOT/GO and MoS2@PEDOT/rGO compos-ites exhibited outstanding EMW absorption performances. In details, the minimum reflection loss (RLmin) and effective absorption bandwidth (EAB) of MoS2@PEDOT/GO can reach-48.65 dB at 4.5 mm, and 6.48 GHz (11.52-18 GHz) at 2.2 mm, respectively. And the EAB of MoS2@PEDOT/rGO can reach 7.04 GHz (10.8-17.84 GHz) with an optimized RLmin of-32.41 dB at 2.1 mm under 20 wt% filler loading. Therefore, these composites can be regarded as competitive candidates for lightweight and high-efficient EMW absorbers. (c) 2022 Elsevier Inc. All rights reserved.