Increasing both the electromagnetic shielding and thermal conductive properties of three-dimensional graphene-CNT-SiC hybrid materials

• 3D graphene-CNT-SiC hybrid materials achieve a thermal conductivity of 123 W·m–1·K–1 and electromagnetic shielding effectiveness of 29.3 dB at 2% SiC addition. • SiC whiskers form a framework for longitudinal thermal conduction, while CNTs create dendritic structures that enhance interfacial bonding and dielectric loss. • The aqueous-phase reduction method enables self-assembly of graphene oxide into a three-dimensional porous structure, facilitating the integration of SiC and CNTs. • The hybrid material demonstrates dual functionality, addressing both heat dissipation and electromagnetic interference shielding for electronic packaging applications.