Journal
ACS APPLIED NANO MATERIALS
Volume 4, Issue 1, Pages 691-701Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02983
Keywords
MXene; metal-organic frameworks; microwave absorption; electromagnetic; self-assembly
Funding
- Innovation Foundation for School-enterprise Collaboration of Northwestern Polytechnical University [XQ201912, 2019JLM-32]
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Combining MXene with metal-organic frameworks resulted in high-performance absorbers with excellent absorption properties and broad absorption bandwidth, showcasing promising potential for tunable electromagnetic properties.
High-performance absorbers with laminated and three-dimensional structures for abundant interfaces can improve electromagnetic wave absorption property obviously. Meanwhile, the combination and dispersion of components have a positive effect on the microwave absorption (MA) property for excellent absorption bandwidth. Herein, accordion-like MXene/Co-ZIF and MXene/Ni-ZIF composites were synthesized by electrostatic self-assembly between MXene and metal-organic frameworks (Co-MOF and Ni-MOF) and then pyrolyzed in the H-2/Ar mixed atmosphere (Co-MOF and Ni-MOF named as Co-ZIF and Ni-ZIF, respectively, after pyrolysis). The MXene/Co-CZIF 50% composites displayed good absorption performance with the optimal R L value of -60.09 dB at 7.36 GHz and the broadened absorption bandwidth 9.3 GHz (R-L < -10 dB). MXene/Ni-CZIF 50% exhibited promising performance with the R L value measured up to -64.11 dB at 5.12 GHz, and possessed the ultrabroad effective response bandwidth of 4.56 GHz (R-L < -10 dB). Furthermore, a unique accordion-like structure, magnetic-dielectric synergistic, multiple interface scatterings and reflections, and dipole polarization were said to improve MA properties. This study provided a method for the synthesis of absorbers with tunable electromagnetic properties and wide absorption bandwidth of MXene-based composites.
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