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

• Published in: Journal of alloys and compounds Vol. 961; p. 170992
• Main Authors: Fang, Debao, Liu, Shiqiao, Li, Jingbo, Jin, Haibo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25.10.2023
• Subjects: HFSS simulation; Microwave absorption; MIL-68; ZIF-67; MIL-68; Microwave absorption; ZIF-67; HFSS simulation
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.170992

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. [Display omitted] •ZIF-67 polyhedrons are anchored on the surface of MIL-68 using a facile method.•MOF-derived In/C@Co/C composites show excellent microwave absorption performance.•Structural absorbers are designed to broaden the EAB through HFSS simulation.•Absorption mechanisms of absorbers and designed structures are investigated.