Electromagnetic wave absorption of hierarchical porous MWCNTs@ZnO/NiO composites enhanced by multiple polarization and d
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Electromagnetic wave absorption of hierarchical porous MWCNTs@ZnO/NiO composites enhanced by multiple polarization and dielectric loss Mingqiang Hu1, Honglong Xing1,* 1
, Ran Shi1, and Xiaoli Ji1
School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, People’s Republic of China
Received: 15 June 2020
ABSTRACT
Accepted: 18 August 2020
In this study, two MWCNTs@ZnO/NiO composites, TS-A and TS-B, were synthesized through two methods, respectively, and a series of microscopic morphology characterization and electromagnetic test were performed. Microstructure characterization results suggested that TS-A dispersed well with hierarchical and porous structure, while TS-B grew unevenly as a result of tight bound. Electromagnetic tests show that the unique hierarchical and porous structure was key to the superior absorption performance of TS-A over TS-B, and played an important role in optimizing impedance matching and enhancing dielectric loss. The minimum reflection loss of TS-A reached - 46.65 dB at the thickness of 3.3 mm and the frequency of 3.58 GHz, and the EAB reached 3.89 GHz at the thickness of 1.5 mm. The above results indicate that the synthesis of hierarchical and porous structure is one of the effective ways to enhance the electromagnetic wave absorption ability of materials.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction With the advent of the era of electronic information, electromagnetic wave plays an important role in the field of electronic information communication obviously [1–4]. While electromagnetic wave brings great development to human society, its disadvantages for the natural environment and even human health have become increasingly apparent [5, 6]. Therefore, in view of these drawbacks, electromagnetic wave absorbing materials that can effectively absorb
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https://doi.org/10.1007/s10854-020-04290-x
electromagnetic waves have become one of the research hotspots at present [7]. Key factors in the design of electromagnetic wave absorbing materials include optimizing the impedance matching characteristics of the material [8, 9] and improving the electromagnetic loss performance of the material [10–12] so that much electromagnetic wave is able to enter the absorbing material and can be rapidly consumed. The electromagnetic loss by dielectric absorbing materials mainly depends on the defect polarization and interfacial polarization [13–15] of the dielectric material itself. The dielectric
J Mater Sci: Mater Electron
absorbing material will be polarized in the alternating electromagnetic field, when the polarization time is less than the period of the alternating electromagnetic field. Then the relaxation process is expected to occur, whose generation and dissipation will lose the electromagnetic wave energy. Therefore, it is especially important to enhance the polarization of the absorbing materials [16–19]. Controlling the microscopic morphology of m
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