3D nitrogen-doped porous magnetic graphene foam-supported Ni nanocomposites with superior microwave absorption properties

Three-dimensional (3D) superlight (bulk density 0.027 g cm⁻³) N-doped magnetic graphene foams-supported Ni nanoparticles (MGF@Ni) have been constructed through in-situ simultaneous deposition of Ni on graphene sheets. The minimum reflection loss can reach −58.7 dB at 13.9 GHz and maximum effective absorption bandwidth (EAB) exceeding −10 dB is up to 5.8 GHz with a thickness of 2.3 mm. Interestingly, The 3D superlight N-doped MGF@Ni composites exhibit much better microwave absorption (MA) properties and corrosion resistance than that of 2D hybrids structure. After treatment in hydrochloric acid for one month, the MGF@Ni still keeps excellent MA performance, indicating MGF@Ni can be used as an efficient MA material in moisture environment. Results show that the enhanced MA properties originate from the special porous structures and synergistic loss mechanisms. Thus, our study indicate that the 3D porous graphene-based composites could be a potential candidate for lightweight and corrosion-resistant microwave absorption materials.