Wood-Derived Porous Carbon/Iron Oxide Nanoparticle\nComposites for Enhanced Electromagnetic Interference Shielding

Abstract

Biomass\nmaterials have attracted attention in optimizing electromagnetic\ninterference (EMI) shielding effectiveness (SE) ascribed to their\nhigh electric conductivities and reinforced polarization effects.\nHere, a wood-derived magnetic nanoparticle/porous carbon (PC) composite\nwas fabricated via an in situ microwave-assisted pyrolysis approach.\nThe unique anisotropic porous structures inherited from natural woods\nact as the three-dimensional conductive network and incorporate the\nmagnetic iron oxide (γ-Fe₂O₃) nanoparticles\nhomogeneously embedded within the matrixes that can further improve\nthe electromagnetic absorption abilities. As a result, the Fe/PC composites\ndemonstrate an optimized EMI SE of 44.80 dB at the regions of 8.2–12.4\nGHz (X-band) with a thickness of 3 mm, while the normalized SE (EMI\nSE/volume) could reach 61.88 dB/cm³. Meanwhile, the multifunctional\ncharacteristics such as low density (0.271 g/cm³), hydrophobicity\n(water contact angle 132.2°), and mechanical stability (compression\nstrength 11.1 MPa) can be achieved in Fe/PC composites, promising\na great potential for future engineering applications.