Inner phase hybridization engineering of core-shell structure confined in graphene scroll for boosting electromagnetic wave absorption

Rational manipulation of low dimensional composite materials with tunable phase hybridization and hierarchical structure is evolving as a promising strategy to boost electromagnetic (EM) wave absorption performance. Herein, a cation-π interaction-driven assembly and carbothermic reduction strategy is proposed to construct the hierarchical 0D core-shell embedded 1D reduced graphene oxide (rGO) scroll aerogels with tuning phase hybridization in the inner core as EM wave absorption materials for the first time. The metal ions can form strong cation-π interaction with CNTs and graphene oxide (GO) to drive the rolling of GO on the surface of CNTs, generating 1D scroll. During the pyrolysis, the metal ions evenly dispersed in the interlayers of graphene scroll can be in-situ reduced to produce the multiple component magnetic nanoparticles which are coated by carbon to form 0D core-shell structure and phase hybridization of the inner core can be easily regulated by the temperature. Due to the optimized interfacial polarization effect and magnetic-dielectric synergy, the aerogel obtained at pyrolysis temperature of 650 °C exhibit ultrahigh EM wave absorption performance with a minimum reflection loss of −88.70 dB with effective absorption bandwidth of 7.30 GHz at 2.99 mm, overpassing most of the known EM wave absorption materials. This work as a comprehensive research provides a deep understanding upon the primary contribution of phase hybridization and hierarchical structure, well inspiring the further development of low dimensional EM wave absorption materials.