Lightweight poly(m-phenylene isophthalamide)/CF/GO@Fe3O4 composites for enhanced shielding of electromagnetic pollution

In this work, ferroferric oxide (Fe3O4) microspheres with a diameter of similar to 150 nm were in situ grown on the surface of graphene oxide (GO) to obtain GO@Fe3O4 hybrids. Then, novel PMIA/CF/GO@Fe3O4 electromagnetic shielding composites have been developed with a simple and efficient paper-making method using poly(m-phenylene isophthalamide) (PMIA) fibers as matrix and carbon fiber (CF) and GO@Fe3O4 as fillers. Due to the introduction of GO@Fe3O4 and a large number of voids into the materials, the obtained PMIA/CF/GO@Fe3O4 composites exhibit good magnetic sensitivity and low density. Besides, the obtained PMIA/CF/GO@Fe3O4 composites with 10 wt% GO@Fe3O4 loading shows outstanding EMI-shielding effectiveness (EMI SE) of 42.55-46.98 dB at 8-12 GHz, and as the content of GO@Fe3O4 increases to 30 wt%, the EMI SE increases to 55.22 to 60.23 dB. The EMI SE of the PMIA/CF/GO@Fe3O4 composites is far more than the target value (20 dB) required by practical application. Thus, it provides a path to obtain a new class of high-performance and lightweight PMIA-based composites for enhanced shielding of electromagnetic pollution.

Automated summary

In this study, Fe3O4 microspheres and GO were used to prepare hybrid materials, and PMIA/CF/GO@Fe3O4 electromagnetic shielding composites were successfully developed. The composites exhibited good magnetic sensitivity and low density due to the introduction of GO@Fe3O4 and a large number of voids, and showed outstanding EMI shielding effectiveness.