Composites of Non-Woven Poly p-Phenylene Terephthalamide and Fe3O4-Decorated Ti3C2Tx MXene Nanosheets Coated with Ag Nanoparticles for Electromagnetic Interference Shielding

To avoid harm to humans and devices, developing electromagnetic interference (EMI) shielding materials possessing high shielding efficiency and enhanced electromagnetic (EM) wave absorption properties is of fundamental importance. Preventing threats caused by EMI and reducing the secondary pollution of EM waves are critical requirements for materials. In the research described here, composites of Ag nanoparticles coated with poly p-phenylene terephthalamide (PPTA) nonwoven and Fe3O4 decorated MXene nanosheets were prepared by electroless silver plating and Fe3O4-MXene deposition. The top and bottom layers of the composites were Fe3O4 nanoparticle-decorated MXene nanosheets and silicone rubber, while the middle layer consisted of a Ag nanoparticle-coated PPTA nonwoven fabric. The formation of the sandwich structure, the electromagnetic compounding, and the porous structure of the PPTA nonwoven fabric coated with Ag nanoparticles endowed the composites with excellent EMI shielding properties. An EMI shielding effectiveness of 89.92 dB was achieved in the frequency range of 8.2–12.4 GHz. The absorption coefficient A of the composites reached 0.203, which was noticeably enhanced compared with 0.013 of Ag nanoparticle-coated PPTA nonwoven fabric.