双金属MOF衍生的CoZn-C/MWCNTs复合材料用于轻质宽带微波吸收

doi:10.1016/j.actphy.2026.100276

Abstract

Abstract:

Achieving high-performance microwave absorbers characterized by wide bandwidth, robust absorption, lightweight properties, and thin profiles remains a critical challenge within modern radar stealth and electromagnetic compatibility domains. In this study, we introduce a straightforward and cost-effective strategy for fabricating lightweight and efficient microwave absorbers utilizing composites derived from bimetallic zeolitic imidazolate frameworks (ZIFs). A variety of ZIF-8@ZIF-67 precursors incorporating multi-walled carbon nanotubes (MWCNTs) were synthesized through a sequential wet-chemical process. These precursors underwent conversion into porous bimetallic MOF-derived CoZn-C/MWCNTs composites via subsequent pyrolysis. The composition, microstructure, and electromagnetic characteristics of the pyrolyzed materials were precisely regulated by varying the Co/Zn molar ratio within the precursors. Due to the synergistic magnetic and dielectric dissipations, the 3 : 1 Co/Zn composite exhibited the best attenuation constant and impedance matching among all synthesized samples. Thus, the optimized composite provided a significant effective absorption bandwidth of 5.29 GHz at a thickness of 1.9 mm, coupled with an outstanding minimum reflection loss of −23.78 dB at 2.0 mm, even with a minimal filler loading of 20 wt.%. The enhanced scattering suppression behavior was additionally verified through radar cross-section simulation. This research provides a novel viewpoint on the rational design of lightweight MOF-based composites for broadband electromagnetic wave absorption performance.

Key words: Bimetallic MOF derivatives, Microwave absorption, Impedance matching, Carbon-based materials

Yanan Liu, Xiaogang Su, Di Lan, Jiangyong Liu, Weihai Ma, Yaqing Liu. Bimetallic MOF-derived CoZn-C/MWCNTs composite for lightweight and wideband microwave absorption[J]. Acta Phys. -Chim. Sin. 2026, 42(6), 100276. doi: 10.1016/j.actphy.2026.100276

Figures/Tables 7

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References	System	Mass filling ratio (wt.%)	d (mm) @EAB	RL_min	EAB_max
[47]	Ni₂P-HCS	45	1.71	−46.70	4.80
[48]	graphene/MWNTs/PBO	80	2.60	−50.17	4.20
[49]	Ni_SR/NiP/C	25	3.26	−76.97	4.08
[50]	MoxC-Co/C	30	2.09	−71.39	4.08
[51]	FePc/N-rGO	60	3.80	−49.30	4.30
[52]	NG	30	4.00	−13.00	2.10
[53]	PPyCQDs	25	3.25	−27.80	2.34
[54]	RGO/SF/PANI	50	1.50	−45.00	5.48
[55]	N1-GN	40	2.90	−43.20	2.00
This work	BCM-3:1	20	1.90	−23.78	5.29

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Bimetallic MOF-derived CoZn-C/MWCNTs composite for lightweight and wideband microwave absorption

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