Aluminosilicate glass-ceramics/reduced graphene oxide composites doped with lithium ions: The microstructure evolution and tuning for target microwave absorption

Ceramic-based composites are desirable lightweight materials for electromagnetic (EM) energy absorption. However, due to the lack of an effective electromagnetic wave attenuation mode, pure ceramics still face significant challenges in absorbing electromagnetic waves. It is still challenging to obtain advanced electromagnetic wave absorption (EMA) materials with low fillings, thin thickness, super absorption capacity, and effective absorption bandwidth (EAB) through clever microstructure design and appropriate multi-component strategy. Herein, a dielectric aluminosilicate/reduced graphene oxide (RGO) nanocomposite with different lithium content was constructed via a solvothermal sintering method. The microstructure and heterogeneous dielectric interface form perfect impedance matching, multiple polarization, coupling effects, and have excellent absorption performance. The absorbers display a minimal reflection loss (RL_min) of −51.95 dB by tuning the relaxation intensity, and the broadest covers all X band. In addition, the classic RCS simulation method to evaluate microwave absorption performance has practical application value in the field of radar stealth.