Reduced Graphene Oxide/Mxene Composite Foam with Multilayer Structure for Electromagnetic Interference Shielding and Heat Insulation Applications

The electromagnetic interference (EMI) shielding performance of reduce graphene oxide (rGO) foam was restricted to its poor conductivity and macro monotonic structure. In this work, highly conductive MXene nanosheets were introduced into graphene oxide solution and multilayer structures were designed to improve the EMI shielding performance of graphene foam. The multilayer reduced graphene oxide/MXene composite foam shows an excellent EMI shielding effectiveness of more than ~28 dB in C and ~35 dB in X band. Meanwhile, it reveals an outstanding heat insulation performance equaling to air (0.025 W/m·K). The macro multilayer and microporous structure play a prominent role in the EMI shielding and heat insulation performance. This work provides valuable ideas for designing multifunctional EMI shielding materials for the next generation of smart electronic devices.