Synergistic effects between carbon nanotube and anisotropy-shaped Ni in polyurethane sponge to improve electromagnetic interference shielding

Ingenious microstructural design and suitable multicomponent strategy remain challenging for efficient absorption-dominated electromagnetic interference (EMI) shielding materials with light weight, low filling levels thin sample thickness. Herein, a flexible waterborne polyurethane (WPU)/dielectric carbon nanotube (CNT)/magnetic anisotropic Ni (chain or flower) EMI composite sponge based on the unique capsule structure was constructed by dip-coating process. The results show that increasing (flower chain) filler content significantly improves electrical conductivity properties of composites. performances WPU/CNT/8 wt% flower-melamine foam (MF) chain-MF are 42.8 46.7 dB, respectively, which exceed those only CNTs. synergistic effect between CNTs means main mechanism comes from absorption Importantly, owing to protection WPU layer, composites exhibit excellent effectiveness (SE) even under severe physical chemical degradation. This research provides simple approach novel, lightweight, composites, great promise applications in portable wearable electronic devices.