Graphene oxide and zinc oxide nanoparticles have formed a three-dimensional nanocomposite with a high performance of electromagnetic absorption via a hydrothermal process. UV-irradiation removed the remaining oxygen functional groups from the skeleton of the reduced graphene oxide.
The rational design of specific nanostructures with desirable combination of electrical conductivity and magnetism is of significant importance in the field of electromagnetic absorption. To date, it is still difficult to uniformly coat magnetic composition on reduced graphene oxide (RGO) surface, especially through a metal−organic frameworks (MOFs) pyrolyzation strategy, just because of difficulty in even deposition of MOFs on graphene oxide (GO). Herein, we successfully deposit MOFs on GO to form sandwich MOFs/GO/MOFs through the addition of Fe 3+ to MOFs precursor. Then, we adopt a temperature-controlled pyrolysis strategy to transform MOFs/GO/MOFs into sandwich CoFe 2 O 4 /RGO/CoFe 2 O 4 . The nanomaterial exhibits remarkable electromagnetic absorption (EMA) performance, where its maximum effective width reaches 7.08 GHz under 2.6 mm. It is thought that the synergy of electric loss, magnetic loss, and impedance match is ascribed to highperforamnce EMA of this sandwich nanostructure.
Continuous
polypyrrole (PPy) shells were coated on silicon carbide
(SiC) nanowires to form core–shell nanostructures, and the
thicknesses of the shells were efficiently tuned through controlling
the rate of polymerization. Compared with the composites loaded with
pure SiC nanowires, the values of ε′ and ε″
for the composites loaded with PPy@SiC nanowires were strengthened
remarkably along with the increased thickness of the shells. The electromagnetic
absorption (EA) bandwidths lower than −10 and −20 dB
can be monitored in the area of 3.67–18.00 and 4.13–18.00
GHz, when 5 wt % of PPy@SiC nanowires were loaded in the composite.
Meanwhile, the effective EA bandwidth can reach 6.88 GHz, and the
strongest reflection loss is −58.6 dB.
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