A PVDF / MWCNTs / GO @ MWCNTs / AgNWs bilayer structured composite film with ultra‐high EMI shielding and conductivity performance

作者：Renyuan Yang, Yanyan Tan, Teng Zhou, Yuhuan Xu, Shuhao Qin, Daohai Zhang, Shan Liu · 发表于：Polymer Composites · 年份：2024 · DOI：10.1002/pc.28530 · 被引用次数：16 · 研究领域：Electromagnetic wave absorption materials、Dielectric materials and actuators、Advanced Antenna and Metasurface Technologies

Abstract Electromagnetic interference (EMI) shielding materials with easy processing, high electrical conductivity, and excellent absorption loss are urgently needed in aerospace, military stealth and portable electronic devices. In this study, a polyvinylidene fluoride/multi‐walled carbon nanotubes (PVDF/MWCNTs)‐3 wt% composite film prepared by simple solution mixing and polyethylene terephthalate (PET) nonwoven scraping method was used as the substrate, and the PVDF/MWCNTs/graphene oxide@multi‐walled carbon nanotubes (PVDF/MWCNTs/GO@MWCNTs) and PVDF/MWCNTs/GO@MWCNTs/silver nanowires (PVDF/MWCNTs/GO@MWCNTs/AgNWs) bilayer composite films were prepared by vacuum‐assisted filtration (VAF). When the amount of GO@MWCNTs was 20 mL, the conductivity of PVDF/MWCNTs/GO@MWCNTs film is 3.5 × 101 S m −1 , the total EMI shielding effectiveness (EMI SE T ) was 15.5 dB and the EMI absorption efficiency (EMI SE A ) was 10.7 dB, the specific EMI SE (SSE/T) was 539.5 dB/ dB/(cm −2 g). When the amount of AgNWs was 25 mL, the conductivity of PVDF/MWCNTs/GO@MWCNTs/AgNWs film with 0.47 mm thickness was 1.6 × 10 4 S m −1 , the EMI SE T was 69.1 dB, the EMI SE A was 61.1 dB, and the SSE/T was 2320.0 dB cm 2 g −1 . The results show that the absorption was played a dominant role in the EMI shielding mechanism of obtained films. The addition of GO@MWCNTs/AgNWs increases the electrical conductivity and EMI shielding performance of the film more than the addition of GO@MWCNTs. This is mainly because GO，...