Salt template assisted synthesis of Fe@graphene for high-performance electromagnetic wave absorption

As the electromagnetic environment becomes increasingly deteriorated and complex, there is an increasing ur-gency for electromagnetic wave absorbing materials with thin, light, and wide strength characteristics. Graphene-based composites are considered candidates for the next generation of microwave absorbing materials. To realize the large-scale preparation of graphene-based materials, we utilize a modified salt template assisted pyrolysis method and innovatively chose iron phthalocyanine as the carbon source to prepare Fe@graphene. KCl cubic templates are prepared using an anti-solvent method, and iron phthalocyanine is pyrolyzed on the surface to form graphene and loaded with Fe particles in situ. The prepared Fe@graphene achieves extremely excellent electromagnetic wave absorption performance, with an effective absorption bandwidth of 7.9 GHz at a filling level of only 1 wt%. The effect of material dispersion and cubic structure is also investigated in this paper using finite element simulation.

Automated summary

With the deterioration and complexity of the electromagnetic environment, there is an increasing demand for thin, light, and wideband electromagnetic wave absorbing materials. Graphene-based composites are considered as potential candidates for future microwave absorbing materials. In this study, Fe@graphene was prepared using a modified salt template method and iron phthalocyanine as the carbon source. The Fe@graphene achieved excellent electromagnetic wave absorption performance with an effective absorption bandwidth of 7.9 GHz at a filling level of 1 wt%. The effect of material dispersion and cubic structure was also investigated using finite element simulation.