Electromagnetic Interference Shielding Performance of Flexible, Hydrophobic Honeycomb‐Structured Ag@Ti 3 C 2 T x Composites

Abstract Novel honeycomb‐structured Ag@Ti 3 C 2 T x composites are prepared by a microwave‐assisted synthesis method using polymethyl methacrylate as an expendable template. The resulting Ag@Ti 3 C 2 T x composites retain their original spherical morphology and exhibit hydrophobic performance, low thermal conductivity, and excellent electromagnetic interference (EMI) shielding performance. Remarkably, the Ag ‐1.8 @Ti 3 C 2 T x composite attains electromagnetic interference shielding performance with a maximum average shielding effectiveness of 39.36 dB in the X‐band and 43.64 dB in the K u ‐band. This outstanding performance is the result of conduction loss, interface polarization between Ag nanoparticles and Ti 3 C 2 T x nanosheets, and multi‐reflection and scattering caused by the hollow structure in the honeycomb‐structured Ag@Ti 3 C 2 T x composites. Overall, the honeycomb‐structured Ag@Ti 3 C 2 T x composites possess merits such as light weight, flexibility, hydrophobicity, and EMI shielding performance, suggesting great application potential in smart electronic devices.