Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Graphene‐based composites offer immense potential for overcoming the challenges related to the performance, functionality, and durability in microwave absorption. In this study, a sandwich‐like graphene‐based composite is successfully fabricated by an interfacial engineering of amorphous carbon microspheres (ACMs) and reduced graphene oxide (rGO), with a structure of rGO/ACMs/rGO. The as‐prepared rGO/ACMs/rGO composite presents comparable/superior reflection loss characteristics in the frequency range of 2.0–18.0 GHz to previous composites of graphene and high‐density magnetic particles. Electromagnetic parameters and simulation results reveal that well‐matched characteristic impedance and proper dielectric loss, as well as multiple reflections and interfacial polarizations derived from the unique microstructure should account for the enhanced microwave absorption of rGO/ACMs/rGO. More importantly, rGO/ACMs/rGO exhibits durable performance after being treated at high temperature for a long time. This work provides a new idea for exploring high‐performance and durable microwave absorbers of graphene‐based materials.