The development of high-efficiency
microwave absorbers for C and
X bands still remains a challenge, limiting the settlement of corresponding
electromagnetic pollution and radar stealth. In this work, a reduced
graphene oxide (RGO)/Cu/Fe3O4 composite is successfully
proposed by a one-step solvothermal method with a GO dispersion content
of 5 mL, where Fe3O4 exhibits high magnetic
loss from natural resonance at the C band, and Cu nanorods and RGO
are introduced as dual conductive phases to produce suitable dielectric
properties by regulating the percolation threshold. The results show
that the existence of Cu nanorods significantly reduces the conductivity
and dielectric loss of the composites, optimizing the coordination
of attenuation capacity and impedance matching in the C and X bands.
Consequently, the obtained RGO/Cu/Fe3O4 composite
shows outstanding microwave absorption performance with the maximum
effective absorption bandwidth (EAB) value of 5.2 GHz at a thin thickness
of 3.1 mm, which covers 84% of the C band and 46% of the X band (4.64–9.84
GHz). The performance is superior to the vast majority of previous
absorbers in the corresponding bands.
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