PVDF / MWCNTs / RGO @ Fe 3 O 4 / AgNWs composite film with a bilayer structure for high EMI shielding and electrical conductivity

作者：Yanyan Tan, Yu Xue, Kuntian Li, Shan Liu, Fang Tan, Xiao Wu, Qingqing Qin, Ting Lei, Yuanyuan Yang, Shuhao Qin, Daohai Zhang · 发表于：Polymer Composites · 年份：2023 · DOI：10.1002/pc.27803 · 被引用次数：14 · 研究领域：Electromagnetic wave absorption materials、Urban Transport Systems Analysis、Environmental Engineering and Cultural Studies

Abstract With the renewal of electromagnetic shielding materials, conducting polymer electromagnetic shielding composites stand out. In the article, ferric tetraoxide‐modified reduced graphene oxide (RGO@Fe 3 O 4 ), silver nanowires (AgNWs) and polyvinylpyrrolidone (PVP K30) were blended to form a solution colloid, and polyvinylidene fluoride/carbon nanotubes (PVDF/MWCNTs)‐3 wt% composite film was used as the substrate, then the PVDF‐based bilayer composite films were prepared by vacuum‐assisted filtration (VNF).When RGO@Fe 3 O 4 was added in the amount of 10 mL, the electrical conductivity of PVDF/MWCNTs/RGO@Fe 3 O 4 ‐10 bilayer composite film is 1.7 × 10 1 S·m −1 , the total electromagnetic shielding effectiveness (EMI SE T ) was 20.4 dB, of which the absorption loss accounted for 82.4%, and the specific electromagnetic shielding effectiveness (SSE/t) was 590.9 dB/(cm 2 ·g −1 ). After the addition of 25 mL AgNWs, the electrical conductivity of PVDF/MWCNTs/RGO@Fe 3 O 4 /AgNWs‐25 bilayer composite film up to 4.9 × 10 4 S·m −1 , the EMI SE T was 94.4 dB, of which the absorption loss accounted for 85.4%, and the specific electromagnetic shielding effectiveness (SSE/t) was 3629.3 dB/(cm 2 ·g −1 ). It indicates that the electromagnetic shielding mechanism of both bilayer composite films is dominated by absorption loss. The addition of RGO@Fe 3 O 4 /AgNWs increases the electrical conductivity and electromagnetic shielding effectiveness of the bilayer composite films more than RGO@...