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. With the rapid advancement of information technology, our electronic devices are becoming increasingly smarter, thinner, lighter, and more sensitive. Therefore, adequate electromagnetic interference (EMI) shielding from advanced materials being conductive, lightweight, slim, and flexible is in great demand. Here, utilizing nanoporous metal-based chemical vapor deposition, we have successfully developed bicontinuous nanoporous graphene and realized excellent shielding effectiveness by integrating lightweight, minimal thickness, mechanical flexibility, and high electrical conductivity into one environmentally stable and friendly carbon-based material. The interconnected 3D nanoarchitecture can effectively preserve the excellent electrical conductivity of graphene and provide abundant internal surfaces to reflect and absorb electromagnetic waves in a low density and a minimal sample thickness, which effectively overcomes the conflicting demands of EMI materials and provides an immense EMI-shielding effectiveness for commercial use. Bi-continuous nanoporous graphene synergistically provides high conductivity and high electromagnetic interference (EMI) shielding capability at a minimal sample thickness. This nanoarchitecture takes advantage of abundant wave-reflecting and -absorbing interfaces from nano-sized pores and atomically thin graphene walls, giving rise to superb specific EMI-shielding performances. The scalable nanoporous graphene well reserves the EMI-shielding effectiveness under external stretching and shows great promise for applications in aerospace, personal protection, and modern flexible electronics.
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