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Engineering Dielectric Loss of FeCo/Polyvinylpyrrolidone Core‐Shell Nanochains@Graphene Oxide Composites with Excellent Microwave Absorbing Properties
Author(s) -
Cui Erbiao,
Pan Fei,
Xiang Zhen,
Liu Zhicheng,
Yu Lunzhou,
Xiong Juan,
Li Xiang,
Lu Wei
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202000827
Subject(s) - materials science , reflection loss , graphene , polyvinylpyrrolidone , composite material , dielectric loss , dielectric , microwave , nanoparticle , oxide , amorphous solid , composite number , nanotechnology , optoelectronics , metallurgy , chemistry , physics , organic chemistry , quantum mechanics , polymer chemistry
FeCo alloy nanoparticles, as a kind of material with high saturation magnetization, have attracted wide attention in electromagnetic (EM) wave research. However, its application as a wave‐absorbing material is limited by its poor magnetic anisotropy and antioxidant properties. Herein, novel FeCo/Polyvinylpyrrolidone core‐shell nanochains@graphene oxide (GO) composites are successfully fabricated with superior microwave‐absorbing properties. The composites perform excellently in absorbing EM wave, with a strong reflection loss (RL) of −40.94 dB at 14.25 GHz, covering from 10.95 to 15.85 GHz (RL < −10 dB) with a matching thickness of 2.0 mm. The superior absorption properties are mainly attributed to the cooperation between amorphous magnetic FeCo nanoparticles and graphene, which contribute to the magnetic and dielectric loss, respectively. Moreover, the FeCo/PVP core‐shell morphology enhances the interfacial relaxation and surface chemical stability of the FeCo nanochains. Thus, this work provides a template for the new‐designed and facile‐synthesized EM wave‐absorbing material.