Customized unique core-shell Fe2N@N-doped carbon with tunable void space for microwave response

Here, we report a unique core-shell nanocomposite of Fe 2 N@N-doped carbon that coats dopamine-derived carbon shells on porous Fe 2 N nanoparticles via a facile and effective soft chemical method . The feasibility of preparing core-shell structure in the process of polymerization is realized by utilizing the fact that affluent amino and hydroxyl groups in dopamine endow the formidable chelation ability with metal ions. Temperature-dependent volume shrinkage effect of Fe 2 N originates from the lattice transformation in nitridation process, which is the key factor to control the void space inside carbon nanocubes and optimize the electromagnetic performance. Consequently, the as-prepared samples achieve excellent reflection loss (RL) values and effective absorption bandwidth at an even thin thickness of 1.4 mm. The balance between the temperature-dependent conduction loss and the optimization of hole structure impedance matching may be responsible for the excellent microwave behaviors. This work offers an attractive core-shell Fe 2 N@carbon with controllable void space as a promising candidate to handle the electromagnetic interface (EMI) issues.