Unprecedented Electromagnetic Interference Shielding from Three-Dimensional Bi-continuous Nanoporous Graphene

Summary

Three-dimensional (3D) graphene foams are the most promising alternative to all carbon-based electromagnetic interference (EMI) shielding materials and have shown potential shielding capability to meet the demands of next-generation mobile electronics devices. However, the EMI-shielding performances of the 3D graphene materials strongly depend on porous configurations. It is expected that the ideal 3D architecture can effectively preserve the excellent electrical conductivity of graphene. Here, we report highly conductive bi-continuous nanoporous graphene, which shows outstanding EMI-shielding effectiveness of 50.9 and 83 dB at the film thicknesses of 150 and 300 μm, respectively. Such high shielding effectiveness values from the lightweight and flexible nanoporous films give rise to superior specific shielding effectiveness up to 75,407 and 61,630 dB cm² g⁻¹. The ultrahigh EMI-shielding performance is attributed to abundant wave-absorbing interfaces at minimal thicknesses and high conductivity from interconnected graphene networks in the bi-continuous porous 3D nanoarchitecture.