聚偏氟乙烯电纺纳米纤维嵌入Fe3O4纳米粒子和导电聚(3,4-亚乙基二氧噻吩)壳用于电磁干扰屏蔽《ACS Applied Nano Materials》

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

Sol Lee, Chang Geun Kim, Minje Kim, Joomin Park, Ick-Jae Yoon, and Junghyo Nah*

Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Korea

ACS Appl. Nano Mater. 2022, XXXX, XXX, XXX-XXX

Publication Date: October 10, 2022

https://doi.org/10.1021/acsanm.2c03779

Abstract

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.

KEYWORDS:

• electromagnetic interference shielding material

• nanofiber

• PEDOT

• iron oxide nanoparticle

• polyvinylidene fluoride

• composite

SUBJECTS:

• Composites,

• Fluoropolymers,

• Materials,

• Plastics,

• Polymers