Synthesis and characterization of MoS2/Fe@Fe3O4 nanocomposites exhibiting enhanced microwave absorption performance at normal and oblique incidences
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第9期
论文作者：Peng Wang Junming Zhang Guowu Wang Benfang Duan Donglin He Tao Wang Fashen Li
文章页码：1931 - 1939
摘 要：Herein,we attempted to prepare MoS2/Fe@Fe3 O4 nanocomposites capable of strongly absorbing broadband incident electromagnetic（EM）radiation and probed the effects of their composition on complex permittivity and permeability at 2-18 GHz.Calculations of normal-incidence reflection losses（RLs）based on EM parameters revealed that the Fe@Fe304 to MoS2 mass ratio strongly influenced the absorption peak intensity and bandwidth.Specifically,an RL peak of-31.8 dB@15.3 GHz and a bandwidth（RL<-10 dB）of 4.8 GHz（13.2-18 GHz）were achieved at a thickness of 1.52 mm and a Fe@Fe3 O4 to MoS2 mass ratio of60:40.Further,RL and bandwidth were investigated for oblique incidence,in which case two kinds of EM waves（TE-electric field perpendicular to plane of incidence;TM-electric field in the plane of incidence）were considered.The absorption peaks of TE and TM waves did not exceed-20 dB when the incidence angle increased to 30°,and the bandwidth（RL<-10 dB）reached 4.2 GHz（TE wave）and 4.0 GHz（TM wave）when this angle was further increased to 40.0° and 50.4°,respectively.Finally,the mechanism of microwave absorption was discussed in detail.
Peng Wang1，Junming Zhang1，Guowu Wang1，Benfang Duan1，Donglin He1，Tao Wang1,2，Fashen Li1
1. Key Laboratory for Magnetism and Magnetic Materials, Ministry of Education, Lanzhou University2. Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University
摘 要：Herein,we attempted to prepare MoS2/Fe@Fe3 O4 nanocomposites capable of strongly absorbing broadband incident electromagnetic（EM）radiation and probed the effects of their composition on complex permittivity and permeability at 2-18 GHz.Calculations of normal-incidence reflection losses（RLs）based on EM parameters revealed that the Fe@Fe304 to MoS2 mass ratio strongly influenced the absorption peak intensity and bandwidth.Specifically,an RL peak of-31.8 dB@15.3 GHz and a bandwidth（RL<-10 dB）of 4.8 GHz（13.2-18 GHz）were achieved at a thickness of 1.52 mm and a Fe@Fe3 O4 to MoS2 mass ratio of60:40.Further,RL and bandwidth were investigated for oblique incidence,in which case two kinds of EM waves（TE-electric field perpendicular to plane of incidence;TM-electric field in the plane of incidence）were considered.The absorption peaks of TE and TM waves did not exceed-20 dB when the incidence angle increased to 30°,and the bandwidth（RL<-10 dB）reached 4.2 GHz（TE wave）and 4.0 GHz（TM wave）when this angle was further increased to 40.0° and 50.4°,respectively.Finally,the mechanism of microwave absorption was discussed in detail.
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