American Chemical Society
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Electrospun Polyvinylidene Fluoride Nanofibers with Embedded Fe3O4 Nanoparticles and Conductive Poly(3,4-ethylenedioxythiophene) Shells for Electromagnetic Interference Shielding

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journal contribution
posted on 2022-10-10, 12:33 authored by Sol Lee, Chang Geun Kim, Minje Kim, Joomin Park, Ick-Jae Yoon, Junghyo Nah
Flexible and lightweight electromagnetic interference (EMI) shielding materials with excellent EMI shielding performance have attracted significant attention because of their potential applications in various fields. In this study, we reported the fabrication and performance of polyvinylidene fluoride (PVDF) composite nanofiber (NF) EMI shielding materials composed of Fe3O4 nanoparticles (NPs)-embedded PVDF and conductive poly(3,4-ethylenedioxythiophene) (PEDOT) shells. By separating the conductive NF surface, which was prepared using a vapor phase polymerization (VPP) method, from the magnetic nanoparticle region inside the NF, high conductivity of the shell can be maintained and unaffected even when the wt % of Fe3O4 NPs inside the NF is increased. Therefore, the EMI shielding performance can be maximized by simultaneously increasing the conductivity and permeability of the NFs. Fe3O4 NPs embedded in the NF also contributed to increasing permeability and interfacial polarization, boosting multiple reflection and scattering, and absorption of incident EM waves through magnetic and dielectric loss. Additionally, the multi-layered NF structure is suitable to facilitate a multiple reflection mechanism. Consequently, high EMI SE and absolute EMI shielding effectiveness (SSEt) of 18,760 dB·cm2/g were achieved. The EMI shielding material developed in this study can easily be adopted for various applications because of its superb flexibility, hydrophobicity, ultrathin thickness, and robustness.

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