标题：In situ constructed honeycomb-like NiFe2O4@Ni@C composites as efficient electromagnetic wave absorber

入藏号：WOS:000749853600008

中国科学院文献情报中心期刊分区：化学1区/TOP（2022）

本校作者：刘智欣；王益群*；鄢永烈；柴梁；杜海英

来源出版物：JOURNAL OF COLLOID AND INTERFACE SCIENCE  卷：608  页：2849-2859 子辑：3

出版年：2022

第一地址：成都理工大学

关键词：Honeycomb shape;Core-shell structure;Porous carbon microsphere;Nickel ferrite;Microwave absorption;In-situ construction

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摘要：Rational excogitation of microstructure and chemical constituents is a superior means of constructing electromagnetic wave (EMW) absorption materials with high performance. In this study, a kind of honeycomb-like NiFe2O4@Ni@C composite is prepared via an uncomplicated polymerization, pyrolysis and etching. Porous structure and internal cavity of NiFe2O4@Ni@C contribute to the numerous reflection and scattering of EMW. The strong ferromagnetic resonance of NiFe2O4 core and the multiple relaxation processes of porous carbon shell strongly promote the EMW loss. Additionally, the synergistic effect can improve impedance matching. The results demonstrate that the minimum reflection loss (RL) of honeycomb-like NiFe2O4@Ni@C composites is -65.33 dB at 13.63 GHz. The effective absorption bandwidth (EAB) is 3.68 GHz when the matching thickness is 4.95 mm. The mechanism of EMW dissipation of the honeycomb-like NiFe2O4@Ni@C composites is attributed to multiple reflections and scattering, conductive loss, interfacial polarization and ferromagnetism resonance. This work provides a tactic for the excogitation and synthesis of a low cost, light weight and efficient EMW absorber. 

文章链接地址: https://www.sciencedirect.com/science/article/pii/S002197972101897X?via%3Dihub