Microwave Absorption Properties of FeCo/SnO2 Composite Nanofibers

doi:10.11901/1005.3093.2022.150

Chinese Journal of Materials Research

2023, Vol. 37

Issue (2): 102-110 DOI: 10.11901/1005.3093.2022.150

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Microwave Absorption Properties of FeCo/SnO₂ Composite Nanofibers

ZHANG Kaiyin¹, WANG Qiuling¹, XIANG Jun²(

)

^1.School of Mechanical and Electrical Engineering, Wuyi University, Wuyishan 354300, China
^2.School of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Cite this article:

ZHANG Kaiyin, WANG Qiuling, XIANG Jun. Microwave Absorption Properties of FeCo/SnO₂ Composite Nanofibers. Chinese Journal of Materials Research, 2023, 37(2): 102-110.

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Abstract

A novel nanofibrous absorber composed of FeCo alloy and SnO₂ has been synthesized through electrospinning coupled with hydrogen reduction. Its structure, morphology, magnetic and electromagnetic properties were characterized by X-ray diffractometer, scanning electron microscopy, vibrating sample magnetometer and vector network analyzer, and the effect of the molar ratio of SnO₂ to FeCo on the microwave absorption properties of the composite nanofibers is investigated. It was found that the introduction of an appropriate amount of SnO₂ can significantly enhance the microwave absorption properties of FeCo/SnO₂ nanofibers as a result of the improved impedance matching, the good synergistic effect between magnetic FeCo alloy and dielectric SnO₂, and the enhanced interfacial polarization relaxation, as well as the multiple scattering and reflection caused by the 3D network structure formed by the nanofibers. When the SnO₂ molar content in the nanofibers is 20% the minimal reflection loss value of -40.2 dB is obtained at 10.95 GHz for a thin coating of 1.4 mm, and the corresponding effective absorption bandwidth with reflection loss lower than -10.0 dB is about 2.64 GHz (9.75-12.39 GHz). Moreover, when the coating thickness is reduced to 1.0 mm, the effective absorption bandwidth reaches 4.16 GHz (13.84~18.00 GHz). These excellent absorbing performances suggest that the FeCo/SnO₂ composite nanofibers designed here could be a promising electromagnetic absorbing material with a strong and broad absorption band.

Key words: composite FeCo alloys SnO₂ nanofibers microwave absorption electrospinning

Received: 17 March 2022

ZTFLH:

TB333

Fund: Natural Science Foundation of Fujian Province, China(2020J01393);National Natural Science Foundation of China(51271059);Talent Funding of Wuyi University(YJ202115);Talent Funding of Wuyi University(YJ202116)

About author: XIANG Jun, Tel: 15952808679, E-mail: jxiang@just.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.150 OR https://www.cjmr.org/EN/Y2023/V37/I2/102

Fig.1 XRD patterns of the prepared FeCo/SnO₂ composite nanofibers

Fig.2 FESEM images of FCSO0 (a), FCSO1 (b), and FCSO2 (c)

Fig.3 Room-temperature magnetic hysteresis loops of the FeCo/SnO₂ composite nanofibers

Fig.4 Frequency dependence of the complex permittivity (a), dielectric loss tangent (b), complex permeability (c) and magnetic loss tangent (d) for the FeCo/SnO₂ composite nanofibers

Fig.5 Cole-Cole curves of FCSO0 (a), FCSO1 (b) and FCSO2 (c); (d) μ″(μ' )^–2f^–1 values of the FeCo/SnO₂ composite nanofibers

Fig.6 RL curves and relationships between the matching thickness and RL peak frequency under λ/4 condition for FCSO0 (a, d), FCSO1 (b, e) and (c, f) FCSO2

Table 1 Absorption properties of some ferromagnetic metal/dielectric oxide composites

Fig.7 Attenuation constants (a) and impedance matching rations (b) of the FeCo/SnO₂ composite nanofibers

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