Microwave absorption enhancement of e-Fe3O4@C microspheres by core surface modification
Microwave absorption enhancement of e-Fe3O4@C microspheres by core surface modification
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核表面修饰增强e-Fe3O4@C微球的微波吸收
DOI:
10.1016/j.jallcom.2020.155307
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发表时间:
2020-09
期刊:
影响因子:
--
通讯作者:
Xinglong Wu
中科院分区:
文献类型:
--
作者:
Xinjie Yun;Qifan Wu;Lei Feng;Jiancang Shen;Jian Chen;Paul K.Chu;Lizhe Liu;Xinglong Wu
Magnetic particles can be combined with carbon materials to prepare core-shell microwave absorbers and the proper core/shell weight ratio yields the optimal absorption effects. However, few studies have focused on the influence of core surface modification on the microwave absorption performance. In this work, e-Fe3O4@C composite microspheres are synthesized by surface etching of core Fe3O4microspheres in HCl followed by polymerization/carbonization. Core surface modification improves the microwave absorption capability of the e-Fe3O4@C microsphere films. The minimal reflection loss (RLmin) is −54.38 dB at 12.4 GHz for a film thickness of 2.6 mm and the maximum effective bandwidth is extended to 4.1 GHz (3 mm). Etching of the Fe3O4core surface increases the interfacial contact area consequently enhancing interface polarization and defects created by surface etching produce additional dipole polarization to further increase the dielectric loss. The underlying mechanism is investigated and described. The results reveal a novel and effective strategy to enhance the properties of core-shell microwave absorption materials.
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