A flexible and ultrathin graphene film for electromagnetic interference shielding

An ultrathin, lightweight and flexible graphene film was prepared by using a facile vacuum evaporation method followed by a graphitization process. The graphene film exhibited a unique multi-layered structure and high electrical conductivity of 2.1x105S m−1. Moreover, an excellent electromagnetic interference (EMI) shielding effectiveness (SE) of 43 dB in the frequency of 8.2-12.4 GHz was achieved by this film with an ultrathin thickness of 20 µm. The specific EMI SE (SE/thickness) of the film can reach as high as 2150 dB mm−1. Furthermore, the graphene film exhibited excellent flexibility and durability during the bending test. These properties indicate that graphene film is a promising candidate for EMI shielding of new-generation electronic devices.