3D Nest-Like Architecture of Core–Shell CoFe2O4@1T/2H-MoS2 Composites with Tunable Microwave Absorption Performance

作者：Xiangyu Wang, Tao Zhu, Shucheng Chang, Yukai Lu, Wenbo Mi, Wei Wang · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.9b23489 · 被引用次数：298 · 研究领域：Electromagnetic wave absorption materials、Advanced Antenna and Metasurface Technologies、Magnetic Properties and Synthesis of Ferrites

As a promising microwave absorber filler, molybdenum disulfide (MoS 2 ), because of the unique structure, high electrical conductivity, and polarization effect, is receiving more and more interest. Developing MoS 2 -based composites with specific structure and morphology is a hot top in the field of microwave absorbers, because of its strong multiple scattering and reflecting for microwaves as well as its unique interfacial characteristics. Now, with a facile solvothermal method, a novel core–shell CoFe 2 O 4 @1T/2H-MoS 2 composite is synthesized, where the CoFe 2 O 4 nanospheres are entirely embedded in a special three-dimensional (3D) nest-like 1T/2H phase MoS 2 . Notably, in comparison with superparamagnetic CoFe 2 O 4 nanospheres, the coercivities of as-synthesized CoFe 2 O 4 @1T/2H-MoS 2 composites greatly increase. Here, 1T/2H-MoS 2 exhibits ferromagnetism superimposed onto large diamagnetism. It is noted that, by adjusting the content of 1T/2H-phase MoS 2, the microwave absorption performance of as-synthesized composites can be effectively tuned. The combination of 1T/2H-MoS 2 with CoFe 2 O 4 helps to adjust the permittivity and optimize the impedance matching of the composites. Impressively, a minimum reflection loss (R L min ) of −68.5 dB for the as-synthesized composites with a thickness of 1.81 mm is gained at 13.2 GHz; meanwhile, a broad effective bandwidth of 4.56 GHz ranged from 13.2 to 17.76 GHz is achieved at 1.6 mm. Further, the overall effective bandwidth (R...