Journal
ADVANCED COMPOSITES AND HYBRID MATERIALS
Volume 6, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1007/s42114-023-00629-0
Keywords
Energetic metal-organic frameworks; 3D magnetic molecular sponges; Electromagnetic properties; Microwave absorption; Energy dissipation
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Tailoring microstructures and compositions can flexibly tune the electromagnetic properties of materials to realize high-efficiency microwave absorption and attenuation. In this study, a three-dimensional magnetic molecular sponge with ultrahigh porous micro/nanostructure and uniformly dispersed CoFe units was successfully fabricated through an in site transformation process based on combustion. The CoFe@PCS exhibited efficient microwave absorption due to its unique framework microstructure and integrated magnetic-dielectric components.
Tailoring microstructures and compositions can flexibly tune the electromagnetic properties of materials to realize high-efficiency microwave absorption and microwave attenuation. Herein, through an in site transformation process based on combustion, three-dimensional (3D) magnetic molecular sponge with the ultrahigh porous micro/nanostructure and uniformly dispersed CoFe units (denoted as CoFe@PCS) was successfully fabricated through self-propagating combustion from the energetic metal organic framework. Its unique framework microstructure and integrated magnetic-dielectric components give it efficiently microwave absorption. The minimum reflection loss of the CoFe@PCS reaches as - 70.10 dB at the thickness of 2.57 mm with a wide effective absorption bandwidth of 8.64 GHz. More importantly, loss mechanism and energy dissipation inside magnetic sponge are deeply dissected to reveal the relaxation-dominated dielectric loss and dielectric-magnetic synergy. This work offers an ingenious approach for the target design and fabrication of high-performance absorbers.
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