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Synthesis and Excellent Microwave Absorption Properties of ZnO/Fe₃O₄/MWCNTs Composites

Lei Wang

School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, P. R. China

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Honglong Xing

School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, P. R. China

E-mail Address: austxhl@163.com

Corresponding author.

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Zhenfeng Liu

School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, P. R. China

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Ziyao Shen

School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, P. R. China

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Xiang Sun

School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, P. R. China

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, and

Guocai Xu

School of Chemical Engineering, Anhui University of Science and Technology, Huainan, Anhui Province 232001, P. R. China

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https://doi.org/10.1142/S1793292016501393Cited by:21 (Source: Crossref)

Abstract

ZnO nanocrystals were introduced into Fe₃O₄/MWCNTs composites to improve the impedance matching and electromagnetic (EM) wave attenuation of the system. The as-synthesized ZnO/Fe₃O₄/MWCNTs composites were characterized by X-ray diffraction, vibrating sample magnetometer, field-emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy. SEM and TEM images showed that Fe₃O₄ microspheres 100–200nm in size connected MWCNTs. Analysis of EM parameters revealed that the impedance matching of the ZnO/Fe₃O₄/MWCNTs composites was considerably improved after ZnO nanocrystals were introduced. The ZnO/Fe₃O₄/MWCNTs composites exhibited a highly efficient microwave absorption (MA) capacity within the tested frequency range of 2–18GHz. The optimal reflection loss of EM waves was $- 38.2$ $- 38.2$ dB at 6.08GHz with an absorber thickness of 3.5mm. The excellent MA properties of the composites could be attributed to the improved impedance matching, interfacial polarization, and combined effects of dielectric and magnetic losses.

Keywords:

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