Enhanced microwave absorption property of Fe_3O_4/CaCu_(3−x)Mg_xTi_(4−y)Sn_yO_(12(0≤ x, y ≤1))/graphene oxide nanocomposites in epoxy vinyl ester resin

摘要

In this study, CaCu_3Ti_4O_(12), CaCu_2MgTi_4O_(12), CaCu_3Ti_(3.5)Sn_(0.5)O_(12) (CCTO) and Fe_3O_4 nanoparticles were synthesized and characterized by XRD and SEM. Then, the nanocomposites containing different types and content of CCTO, Fe_3O_4 and grapheme oxide in epoxy vinyl ester resin were prepared and the microwave absorption property of the prepared nanocomposites was investigated. The type and content of CCTO, content of Fe_3O_4 and content of graphene oxide were optimized by Taguchi method to obtain the nanocomposite with higher microwave absorption efficiency. The higher absorption efficiency was obtained by the nanocomposite prepared in optimal condition including 3 wt% of CaCu_3Ti_4O_(12), 1 wt% of Fe_3O_4 and 2 wt% of graphene oxide. The reflection loss for prepared nanocomposite was less than −30 dB (absorption ~99, 9%). The great values of the dielectric loss and magnetic loss indicated microwave absorption ability of prepared nanocomposite arises from the effective combination of dielectric-magnetic loss mechanisms.