One-step, template-free, scalable fabrication of N/O-co-doped 2D porous carbon/FeCo nanoparticles with ultralow low filler loading for excellent microwave absorption performance

The integration of magnetic nanoparticles into two-dimensional (2 D) porous carbon with heteroatom doping represents an efficient strategy for the preparation of high-performance carbon-based microwave absorbers. Nevertheless, realizing their large-scale and easy-to-implement synthesis still poses a significant challenge. Herein, a simple and scalable approach is proposed for the fabrication of N/O co-doped porous 2D carbon nanosheets embedded with CoFe nanoparticles via direct carbonization of Co2+/Fe2+-incorporated polyurea nanosheet precursors. The excellent microwave absorption properties, a reflection loss (RL) of −52.2 dB and effective absorption bandwidth (EAB) of 10.08 GHz at filler loading of only 5wt%, can be achieved by adjusting the ratio of Co2+/Fe2+ in precursors. This straightforward and efficient synthetic method for high-performance microwave absorbers exhibits considerable potential for practical application in electromagnetic wave attenuation.