Synthesis of magnetic graphene aerogels for microwave absorption by in-situ pyrolysis

High-performance magnetic graphene aerogels nanocomposites with low density and enhanced microwave absorption properties have been developed firstly by a two-step strategy combining hydrothermal reaction and in situ pyrolysis. TEM images indicate that ultra-fine Ni nanocrystals with a relatively uniform size of 8 nm are anchored to the graphene nanosheets. Meanwhile, the resulting magnetic graphene aerogels possess superparamagnetism. The GA@Ni hybrids of paraffin mixed with an ultra-low filling content (