1. Simultaneous manipulation of polarization relaxation and conductivity toward self-repairing reduced graphene oxide based ternary hybrids for efficient electromagnetic wave absorption.
- Author
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Zhang, Shijie, Pei, Yaxing, Zhao, Zhiwei, Guan, Chunlong, and Wu, Guanglei
- Subjects
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ELECTROMAGNETIC wave absorption , *GRAPHENE oxide , *ELECTROMAGNETIC waves , *IMPEDANCE matching , *DIELECTRIC loss - Abstract
The hierarchical MoS 2 @PEDOT/rGO hybrid exhibited outstanding electromagnetic wave absorption performance stemming from the synergistic effect of well-matched impedance and enhanced dielectric loss. [Display omitted] • MoS 2 @PEDOT/rGO are fabricated through a microwave-irradiated thermal reduction process. • The conductivity and polarization relaxation of hybrids can be regulated effectively. • The ultra-wide EAB of 7.04 GHz for S3 can be obtained. 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 MoS 2 @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 conductivity of composites could be achieved. Profiting from the good impedance matching, ameliorated conductivity and enhanced dipole polarization as well as interfacial polarization by introducing GO/defect-recovered rGO and conductive PEDOT, both the MoS 2 @PEDOT/GO and MoS 2 @PEDOT/rGO composites exhibited outstanding EMW absorption performances. In details, the minimum reflection loss (RL min) and effective absorption bandwidth (EAB) of MoS 2 @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 MoS 2 @PEDOT/rGO can reach 7.04 GHz (10.8–17.84 GHz) with an optimized RL min 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. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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