High-performance electromagnetic interference (EMI) shielding materials possess features of light weight, flexibility and excellent EMI shielding effectiveness. However, continuous efforts are still needed to satisfy the urgent demand for electromagnetic pollution shielding. In this study, a lightweight and flexible hybrid film with a multi-scale double-continuous conductive network (TiO₂/SiO₂@PPy) and sandwich structure (TiO₂/SiO₂@PPy@rGO) was prepared via a delicate structure design of electrospun TiO₂/SiO₂ nanofibers. The hybrid film worked as an effective dissipative medium, leading to a high EMI shielding effectiveness of approximately 30 dB in the X band (8–12 GHz) and excellent specific EMI shielding effectiveness (SE) of ∼13 829 dB cm² g⁻¹. The hybrid film has a tensile strength of 2.71 MPa, while its density is only 0.089 g cm⁻³. The hybrid films maintained good electrical and EMI shielding properties after repeated bending, indicating their favorable flexibility. The delicate structure-design strategy of the electrospun nanofibers presents a practicable way to prepare lightweight and flexible hybrid films for high-performance EMI shielding materials in flexible electronics, military and healthcare applications.

Great improvements for wireless techniques and electronic devices require effective electromagnetic (EM) absorbing materials to solve EM radiation and interference problems. Herein, cobalt sulfide/reduced graphene oxide (CoS/rGO) nanocomposites were prepared through a simple one-pot hydrothermal method. The microwave absorption performance of CoS/rGO nanocomposites with different rGO proportions was systematically investigated. The CoS/rGO 1:1 nanocomposite achieves the reflection loss (RL) value of −37.3 dB at 8.6 GHz. The effective RL values (<−10 dB) of the CoS/rGO 1:1 nanocomposite are obtained in the frequency of 3.4–18 GHz while the thickness varies from 2.0 mm to 5.0 mm. Additionally, the simulated radar cross section results indicate that the CoS/rGO nanocomposites can efficiently suppress the strong EM scattering of metal plate in different incident degrees. These achievements demonstrate that the CoS/rGO nanocomposites can be used as high-performance microwave absorbing materials.