1D magnetic nitrogen doped carbon-based fibers derived from NiFe Prussian blue analogues embedded polyacrylonitrile via electrospinning with tunable microwave absorption

Exploring excellent microwave absorbing materials (MAMs) to manage the electromagnetic (EM) radiation and interference is still a grand challenge nowadays. In this work, NiFe Prussian blue analogues (NiFe-PBA) embedded in polyacrylonitrile (PAN) fibers is prepared by electrospinning, and the derived NiFe nanoparticles embedded in nitrogen doped carbon fibers (NiFe@NCFs) were synthesized followed a heat treatment process. Among the samples, the minimum reflection loss is -39.7 dB at 11.5 GHz with a small thickness of 2 mm and the broadest effective absorption bandwidth (EAB) is 4.6 GHz with a small thickness of only 1.45 mm. The excellent microwave absorption is attribute to the synergistic effect of suitable impedance matching and intrinsic strong attenuation capability. The quantity of NiFe-PBA embedded in PAN fiber-like precursors could effectively regulate the EM parameters of NiFe@NCFs by adjusting the conductivity and magnetic properties. It is believed that this work would opened up a way for designing novel light-weight, ultrathin-thickness, broadband, strong microwave attenuation capability of magnetic carbon-based MAMs.