Journal
ACS APPLIED NANO MATERIALS
Volume 2, Issue 9, Pages 5475-5482Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.9b01076
Keywords
Fe3O4 nanoflower; ultrathin nanosheets; CNTs backbone; microwave absorbing properties; microwave shielding
Funding
- National Natural Science Foundation of China [51671010, 51101007]
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Unsatisfactory reflection loss (R-L) and thick thickness of the absorber severely limit the practical application of advanced electromagnetic (EM) microwave absorbers. Herein, we report a heterogeneous architecture that consists of Fe3O4 nanoflower, which construct from ultrathin nanosheets, and carbon nanotubes (CNTs) backbone to enhance their R-L in low-thickness regions. Thanks to the reasonable structural design and dielectric loss regulation, the optimized Fe3O4/CNTs composites exhibit superior microwave absorbing properties. The minimal R-L is -58.6 dB at 15.28 GHz. Meanwhile, the thickness is only 1.52 mm. Furthermore, when R-L is below -10 dB, the actual absorption bandwidth is as high as 15 GHz at absorber thickness below 5 mm. The effective permeability (mu(r)), permittivity (epsilon(r)), and Z values indicate that the remarkable microwave absorption is attributable to the coordination of the excellent polarization relaxation of CNTs, the good intrinsic magnetic properties of Fe3O4 nanoflower, and the abundant interfacial polarization between Fe3O4 and CNTs.
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