Three-dimensional Conductive Interconnected Graphene Networks for High-Performance Electromagnetic Interference Shielding

As electronic and information technology advance, it is critical to reduce the electromagnetic pollution caused by electronic devices. Herein, graphene foam (GF) was prepared via chemical vapor deposition and composited with polydimethylsiloxane (PDMS) to prepare GF/PDMS composites with excellent flexibility. It was discovered that the GF/PDMS composites morphologically coupled to each other to create a low-density porous network with excellent electrical conductivity. A comprehensive investigation of the relationship between electromagnetic interference (EMI) shielding performance and 3D graphene foam growth conditions indicated that the thickness of graphene, influencing the continuity and conductivity of 3D foam, has a critical influence in how well GF/PDMS composites perform in terms of EMI. Furthermore, the electromagnetic shielding effectiveness and absolute effectiveness of the GF/PDMS composites in our work can be higher than 52 dB and 2800 dB·cm2/g, respectively, which is better than most carbon-based EMI shielding materials. The comprehensive studies on GF/PDMS composites in this work will benefit the application of electromagnetic shielding materials for next-generation aviation and wearable devices.