Co x S y /C@MoS 2 nanofibers: synthesis, characterization and microwave absorption investigation
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CoxSy/C@MoS2 nanofibers: synthesis, characterization and microwave absorption investigation Qing Zhu1, Xue Zhang1, Yuan Zheng1, Ying Xia1, Zhuguang Nie1, Weidong Zhang1,*, Hongxia Yan1, and Shuhua Qi1,* 1
School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Received: 28 August 2020
ABSTRACT
Accepted: 3 October 2020
Microwave absorbing materials have been widely studied and applied nowadays, but their loss mechanism, especially the correlation between attenuation characteristics and impedance matching, is still not clear. In this system comparative study, a novel metal - organic framework with the Co ions (Co-MOF), CoS2@MoS2 and CoxSy/C@MoS2 nanofibers were prepared by hydrothermal reaction and heat treatment. All the samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and vector network analyzer (VSA). The results indicated that the minimum value of reflection loss (RL) for CoS2@MoS2-2 was - 31.12 dB and the corresponding bandwidth with effective attenuation (RL B - 10 dB) was up to 2.36 GHz (from 7.0 to 10.6 GHz) at 2.7 mm. Compared with CoS2@MoS2 composites, the microwave absorbing performance (MAP) of CoxSy/C@MoS2 nanofibers was enhanced obviously: the bandwidth with effective attenuation of CoxSy/C@MoS2 was up to 3.67 GHz (7.24 GHz - 10.91 GHz) with coating thickness 3.7 mm, and the minimum RL value was - 41.32 dB. The enhanced MAP originated from the synergistic effect between polarization loss and conductive loss, which results from CoxSy, MoS2 and introducing C, respectively.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Microwave pollution, due to the various of electronic devices abuse, not only damage some precision instruments but also cause harm to human being’s health and life [1–6]. However, it is still a grant challenge to exploit an efficient microwave absorption material with light-weight, strong absorption,
bandwidth and clear microwave absorption mechanism. To date, so many microwave absorption materials with different structure and based on different design aim have been fabricated, dielectric materials had attracted great interests of researchers [7–12]. Usually, researchers combined carbon and dielectric materials to obtaining a series of excellent microwave absorbing materials [13–20]. Yan et al. [21] investigated the MAP of CoS2/N-doped carbon nanotube
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https://doi.org/10.1007/s10854-020-04601-2
J Mater Sci: Mater Electron
composites, indicating that it had outstanding dielectric properties. To develop an effective material, Zhang et al. [22] fabricated CoS2 nanocrystals embedded into reduced graphene oxide (CoS2/rGO) with tailoring dielectric properties for the enhanced electromagnetic wave absorption. By tailoring the dielectric properties of the nanocomposites, the CoS2/rGO could attach to - 56.9 dB at 10.9 GHz with the thickness of
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