Well-Dispersed CoNiO2 Nanosheet/CoNi Nanocrystal Arrays Anchored onto Monolayer MXene for Superior Electromagnetic Absorption at Low Frequencies

Developing microwave absorbers with superior low-frequency electromagnetic wave absorption properties is one of the foremost important factors driving the boom in 5G technology development. In this study, via a simple hydrothermal and pyrolysis strategy, randomly interleaved CoNiO2 nanosheets and un...

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Bibliographic Details
Published in:Coatings (Basel) 2024-05, Vol.14 (5), p.631
Main Authors: Du, Leiyu, Xu, Renxin, Si, Yunfa, Zhao, Wei, Luo, Hongyi, Jin, Wei, Liu, Dan
Format: Article
Language:English
Subjects:
C band
Crystallites
Decomposition
Electromagnetic absorption
Electromagnetic radiation
Ethanol
Heterostructures
Hydrochloric acid
Impedance matching
Low frequencies
Magnetic properties
Microwave absorbers
Microwave absorption
Microwave attenuation
Morphology
MXenes
Nanocrystals
Nanoparticles
Nanosheets
Nitrates
Permeability
Pyrolysis
Radar cross sections
Scanning electron microscopy
Thickness
Ultrafines
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Summary:Developing microwave absorbers with superior low-frequency electromagnetic wave absorption properties is one of the foremost important factors driving the boom in 5G technology development. In this study, via a simple hydrothermal and pyrolysis strategy, randomly interleaved CoNiO2 nanosheets and uniformly ultrafine CoNi nanocrystals are anchored onto both sides of a single-layered MXene. The absorption mechanism demonstrated that the hierarchical heterostructure prevents the aggregation of MXene nanoflakes and magnetic crystallites. In addition, the introduction of the double-magnetic phase of CoNiO2/CoNi arrays can not only enhance the magnetic loss capacity but also generate larger void spaces and abundant heterogeneous interfaces, collectively promoting impedance-matching and furthering microwave attenuation capabilities at a low frequency. Hence, the reflection loss of the optimal absorber (M–MCNO) is −45.33 dB at 3.24 GHz, which corresponds to a matching thickness of 5.0 mm. Moreover, its EAB can entirely cover the S-band and C-band by tailoring the matching thickness from 2 to 7 mm. Satellite radar cross-section (RCS) simulations demonstrated that the M–MCNO can reduce the RCS value to below −10 dB m2 over a multi-angle range. Thus, the proposed hybrid absorber is of great significance for the development of magnetized MXene composites with superior low-frequency microwave absorption properties.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings14050631