Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 6, Pages 2123-2134Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc06526a
Keywords
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Funding
- National Natural Science Foundation of China [51671146, 51971162, U1933112]
- Program of Shanghai Technology Research Leader [18XD1423800]
- Fundamental Research Funds for the Central Universities [22120180096]
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Developing electromagnetic absorption materials with a strong absorption ability and wide absorption bandwidth has attracted widespread attention in the field of electromagnetic shielding, but it still remains a great challenge. Herein, we successfully developed 2D hierarchically laminated Fe3O4@nanoporous carbon (NPC)@rGO magnetic/dielectric nanocomposites as high-performance microwave absorbers through a facile microwave-assisted approach. The rational design of the composition (Fe3O4, NPC and rGO) and the hierarchical microstructure provided the nanocomposite with a micro-scale 3D magnetic coupling network, a hierarchical dielectric carbon network and good impedance matching, which were identified by the off-axis electronic holography and electromagnetic characterization. As expected, the Fe3O4@NPC@rGO composites achieved a strong reflection loss of -72.6 dB, a matching thickness of 2.0 mm and a broad bandwidth of 5.5 GHz. Such excellent achievements encourage the development of hierarchical magnetic EMA absorbers and provide remarkable inspiration for designing high-performance microwave absorbers.
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