材料科学
纳米复合材料
反射损耗
微波食品加热
电介质
介电损耗
介电常数
阻抗匹配
包层(金属加工)
复合材料
纳米颗粒
磁导率
吸收(声学)
电阻抗
光电子学
纳米技术
复合数
物理
电气工程
工程类
生物
量子力学
遗传学
膜
作者
Zilong Zhang,Zilin Wang,Liuyang Heng,Shuai Wang,Xiqiao Chen,Xiquan Fu,Yanhong Zou,Zhixiang Tang
标识
DOI:10.7566/jpsj.87.054402
摘要
MoS2 is a promising material with microwave absorption performance due to its high dielectric properties and low density. However, pure MoS2 is non-magnetic and has a bad impedance matching characteristic. In this study we prepared the Ni/MoS2 nanocomposites by cladding the MoS2 micrometer slices with magnetic Ni nanoparticles. Our results show that the microwave absorption properties of Ni/MoS2 nanocomposites have been improved obviously compared with the pure MoS2. Because of the introduction of Ni particles, the permeability of the nanocomposites has been turned from one to a complex, indicating a newly added magnetic loss. Meanwhile, the big gap between the permittivity and permeability of the Ni/MoS2 nanocomposites has been properly narrowed, which suggests an improved impedance matching. Moreover, the dielectric Cole–Cole semicircle shows that there are more Debye relaxation processes for the Ni/MoS2 nanocomposites, which further enhances the dielectric loss. Due to its improved electromagnetic properties, the minimum reflection loss (RL) value of the Ni/MoS2 nanocomposites with 60 wt % loading reaches −55 dB and the absorption bandwidth (<−10 dB) is up to 4.0 GHz (10.8–14.8 GHz) with a matching thickness of 1.5 mm. The results provide an excellent candidate for microwave absorbing materials with a broad effective absorption bandwidth at thin thicknesses.
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