Abstract
High performance skin structured Electromagnetic Interference (EMI) shielding composites has been fabricated. Namely, the Ag-coated reduced graphene oxide aerogel film (rGO-AF) and the graphene oxide foam (rGO-F) were combined to form three-dimensional (3D) graphene, which compounded with polydimethylsiloxane (PDMS) matrix to prepare the lightweight flexible composites. Particularly, the distinct skin structure of the composites imparted it excellent EMI shielding performance and unique bidirectional differential performance. When electromagnetic waves (EMWs) run into the skin structured Ag/rGO-AF/rGO-F/PDMS composites along the direction of Ag side or rGO-F side, the total EMI shielding effectiveness (SEtot) of the two cases at X band (8.2 ~ 12.4 GHz) reached 67.3 dB and 68.9 dB respectively, which hardly changed. Nevertheless, when the EMWs pass through the Ag side, the reflection EMI shielding effectiveness (SER) of the material increased. In contrast, when the EMWs passed through the rGO-F side, the overall absorption EMI shielding effectiveness (SEA) improved.
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