Electromagnetic absorption behavior regulation in bimetallic polyphthalocyanine derived CoFe-alloy/C 0D/2D nanocomposites

Efficient tuning of electrical and magnetic property of a material is of great importance in its functional material design, mechanism understanding, and application expanding. In this work, we propose an efficient strategy for the electromagnetic absorption (EMA) behavior regulation of bimetallic polyphthalocyanine (PPc) derived CoFealloy/C nanocomposites. Through the adjusting of calcination temperature and Fe/Co atomic ratio, the microstructure (0D/2D nanocomposite), electrical conductivity, magnetic property, and EMA behavior can be efficiently tuned. After optimization, the efficient absorption bandwidth of CoFe-alloy/C achieves 7.64 GHz, while the maximal absorption gets close to -60 dB, exhibiting superiority to most reported carbon related materials. It is thought that the absorbing mechanism of CoFe-alloy/C is mainly ascribed to the combination of conductance loss, multiple polarization, resonance phenomenon, and hysteresis loss. This research greatly expands the application scope of PPc derivatives, and provides an efficient way to understand the interaction between material and electromagnetic waves.