Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 824, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153980
Keywords
Microwave absorption; Nanofibers; Carbon; Magnetic alloys; Lightweight
Categories
Funding
- National Natural Science Foundation of China, China [51572218]
- Shaanxi Provincial Education Department, China [18JK0786]
- Young Talent Fund of University Association for Science and Technology in Shaanxi, China [20170605]
- Natural Science Foundation of Shaanxi Province, China [2017KCT-01, 2019JM-138]
- Key Project of Research and Development of Shaanxi Province, China [2018ZDCXL-GY-08-05]
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Lightweight, strong and broadband microwave absorbents are urgently demanded for practical applications. Exploring magnetic/dielectric composites by anchoring magnetic nanostructures on lightweight dielectric carbon is an effective way, due to their possible good impedance matching condition. Herein, one-dimensional FeCo/C nanofibers are fabricated by electrospinning method and subsequent anoxic annealing treatment, which are used as difunctional magnetic/dielectric microwave absorbents. The nanofibers have a large aspect ratio, in which tiny magnetic FeCo nanocrystals are uniformly decorated in the amorphous dielectric C nanofibers. Benefiting from good impedance matching condition, enhanced microwave attenuation ability and synergistic effect between ferromagnetic FeCo and dielectric C, the FeCo/C nanofibers exhibit boosting microwave absorption performance, which is related to the absorber thickness and filling ratio. The optimal FeCo/C/paraffin composites with 40 wt% of functional fillers show a minimum reflection loss value of -59.9 dB with broad effective absorption bandwidth of 6.0 GHz at 13.2 GHz when the absorber thickness is only 2.6 mm. The FeCo/C nanofibers have a small density of only about 1.1 g/cm(3), much smaller than the bulk FeCo (7.4-7.6 g/cm(3)). Owing to the characteristics of low density, strong absorption and broad effective absorption bandwidth, the FeCo/C nanofibers are promised to be good candidates as microwave absorbents. (C) 2020 Elsevier B.V. All rights reserved.
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