Superparamagnetic FeCo@SnO2 nanoparticles on graphene-polyaniline: Synthesis and enhanced electromagnetic wave absorption properties

A superparamagnetic quaternary nanocomposite of [email protected]2@[email protected] was prepared via a three-step method. The obtained quaternary nanocomposite was characterized by XRD, TEM, XPS, FTIR, VSM and VNA analysis. The electromagnetic parameters indicate that [email protected]2@[email protected] exhibits enhanced electromagnetic absorption properties compared to FeCo and [email protected]2, which can be mainly attributed to the improved impedance matching. The possible absorption mechanism for the quaternary nanocomposite was also discussed in detail. The maximum reflection loss of [email protected]2@[email protected] can reach −39.8 dB at 6.4 GHz and the absorption bandwidth with the reflection loss exceeding −10 dB is 3.1 GHz (from 4.6 to 7.7 GHz) with the thickness of 3 mm. Our results demonstrate that the [email protected]2@[email protected] nanocomposite can serve as an excellent microwave absorber.