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Absorber design based on In/C@Co/C composites for efficient microwave absorption

2023; Elsevier BV; Volume: 961; Linguagem: Inglês

10.1016/j.jallcom.2023.170992

1873-4669

Debao Fang, Shiqiao Liu, Jingbo Li, Haibo Jin,

Metamaterials and Metasurfaces Applications

Due to increasing electromagnetic pollution, excellent microwave absorption materials (MAMs) are extremely desired in our daily life. In this work, MOF-derived prism-like core-shell structured In/C@Co/C-x (x = 700, 800 and 900) composites were prepared by using a simple pyrolysis approach. The unique hierarchical structure with evenly-distributed Co-nanoparticle magnetic shell covering porous In/C core renders the composites remarkable microwave absorption performance. The In/C@Co/C-800 shows a minimum reflection loss (RLmin) of − 55.14 dB with a broad effective absorption bandwidth (EAB) of 5.12 GHz at 2.19 mm. Moreover, a series of periodic stepped microwave absorption structures based on In/C@Co/C-800 are designed using HFSS to perform the broadband microwave absorption. The EAB of a four-layer periodic stepped structure reaches 15.28 GHz, covering 0.955 of the frequency range. This work demonstrates that a nanoparticle magnetic shell composite of In/C@Co/C achieves efficient microwave absorptions, and proposes a structural design strategy for broadband absorption.