1CoFe/C Nanosheets on Hollow Carbon Fibers as Composite Fabrics for Electromagnetic Interference Shielding

Electromagnetic interference (EMI) shielding material with good flexibility and lightweight is an effective way to eliminate electromagnetic pollution sources. Herein, lightweight, flexible, and strong CoFe/C/HCF composites with hierarchical pore structures were constructed by in situ growth, etching/ion exchange reaction, and high-temperature pyrolysis using cotton fabric (CF) as the substrate. The Co-MOF nanosheet was in situ grown on the surface of CF, and CoFe-LDH nanosheets were formed after the etching/ion-exchange reaction. CoFe/C/HCF composites with hierarchical pore structures were obtained after high-temperature pyrolysis. The hierarchical pore structure was verified using small-angle neutron scattering analysis. The unique hierarchical pore structure and strong interfacial interaction make the composites have higher average shielding efficiency (SE) and specific shielding efficiency (SSE), when the thickness is only 0.9 mm, which reached 30.7 dB and 109.64 dB·cm3 g–1, respectively. Meanwhile, ultrafast photothermal performance is also achieved, which can ensure the normal function of the composite material in cold conditions. This work provides possibilities for the potential applications of CoFe/C/HCF composites in flexible sensing and wearable smart electronics.