Flexible composites by ionic liquid/silver/graphene in towel‐gourd sponge fibers: Synergistic effect and dual‐band electromagnetic interference shielding in X‐band and terahertz‐band

Abstract Flexible polymer composites applied to such dual‐band electromagnetic interference (EMI) shielding were prepared by a facile approach. Firstly, heterogeneous conducting framework was fabricated by incorporating reduced graphene oxide (rGO), silver (Ag) followed with ionic liquids (IL) sequentially in the micro channels of towel‐gourd sponge (TS) fibers to increase the synergistic effect in conductivity. After that, the TS fibers modified by rGO, Ag, and IL (TS@IL‐Ag‐rGO) were blended with melting polyamide elastomer (PA) matrix in the internal mixer to obtain the PA/TS@IL‐Ag‐rGO composites. The composites exhibited high‐EMI shielding effectiveness of 32.3 dB in X‐band and 18.3 dB in THz‐band with 12 wt% fillers content due to the synergistic effect in the heterogeneous conducting framework, which opens an avenue for stretchable materials applied in shielding electromagnetic waves in X‐band and THz‐band at the same time.