In Situ Growth of Fe₃O₄ Nanoparticles in Poly(arylene ether nitrile)/Graphene/Carbon Nanotube Foams for Electromagnetic Interference Shielding

Abstract

Due to the growing severity of electromagnetic radiation pollution, effective and absorption-dominated electromagnetic shielding materials must be developed. In this study, poly(arylene ether nitrile)/ graphene/carbon nanotube (PEN/G/CNT) composite foam was prepared by nonsolvent induced phase separation, and Fe 3 O 4 particles were grown in situ by co-precipitation method, obtaining PEN/G/ CNT/Fe 3 O 4 (GCF) composite foams. The successful incorporation of magnetic Fe 3 O 4 particles was demonstrated by the scanning electron microscope images and the hysteresis loops, which was proved to effectively reduce the impedance mismatch and enhance the dielectric losses and magnetic losses of the composite foams, resulting in improved absorption and reduced secondary electromagnetic pollution. The electromagnetic interference shielding effectiveness (EMI SE) of GCF composite foams rose with the increase of Fe 3 O 4 content and GCF with the Fe 3 O 4 concentration of about 3.55 wt % showed the highest EMI SE of around 38 dB and the highest absorption ratio of about 94%. This effort provides a feasible and effective pathway for the fabrication of lightweight, easily scalable, heat-resistant, and absorption-dominated EMI shielding materials.

Advances in Graphene–Polymer Nanocomposite Foams for Electromagnetic Interference Shielding

“…Zhang and coworkers recently reported a porous absorption-dominated EMI shielding material composed of poly(arylene ether nitrile) (PEN), graphene-carbon nanotubes, and Fe3O4 particles [57]. The composite foam was obtained by soaking the casting film of PEN/iron ions/graphene/carbon nanotubes in DMAc/NH4 • H2O via nonsolvent-induced phase separation (NIPS).…”

Ti3C2Tx MXene Nanosheet/Cellulose Nanofiber/Poly(ethylene glycol) Porous Composites for Absorption-Dominated Electromagnetic Interference Shielding

“…The dielectric loss provided by MXene and the coordination of polarization with loss at the interfaces contribute to the outstanding EMI shielding effectiveness (EMI SE) (39 dB) and absorption effectiveness (28 dB) of the films. However, due to the high conductivity of its surface, similar electromagnetic shielding materials are reflection-based and will produce a strong reflection of electromagnetic waves, and do not fundamentally eliminate electromagnetic waves, the existence of reflected electromagnetic waves will still cause secondary pollution of electromagnetic waves. − Considering these problems, materials with absorption-dominated electromagnetic shielding have been widely studied recently. , …”

High-performance EMI shielding effectiveness of Fe3O4–3D rPC nanocomposites: a systematic optimization in the X-band region

“…21 Thus, the combination of magnetic and conducting NCs positively enhances the MWA performance. [22][23][24] Qianqian Chen et al found that the Fe 3 O 4 -modified oligolayered Ti 3 C 2 T x nanocomposites exhibit high dielectric constant as well as permeability due to the superior magnetic and conducting network in the composites, and the combination resulted in EMIS (61.19 dB) with a 2.6 mm thick shield. 25 In addition, the reported Fe 3 O 4 -rGO binary nanostructured materials exhibited outstanding SE T values of 59.4 dB, as a result of the good impedance matching between permittivity/permeability and electric/magnetic dissipation.…”

“…21 Thus, the combination of magnetic and conducting NCs positively enhances the MWA performance. 22–24…”