通过改善阻抗匹配和导电性制备电磁波屏蔽聚偏二氟乙烯-TiCT MXene-碳纳米管复合材料

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride-TiCT MXene-Carbon Nanotube Composites by Improving Impedance Matching and Conductivity.

作者信息

Zhang Qimei, Cui Jian, Zhao Shuai, Zhang Guangfa, Gao Ailin, Yan Yehai

机构信息

Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.

School of Materials and Environmental Engineering, Chizhou University, Chizhou 247000, China.

出版信息

Nanomaterials (Basel). 2023 Jan 19;13(3):417. doi: 10.3390/nano13030417.

DOI:10.3390/nano13030417

PMID:36770378

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9921545/

Abstract

Absorption-dominated electromagnetic interference (EMI) shielding is attained by improving impedance matching and conductivity through structural design. Polyvinylidene fluoride (PVDF)-TiCT MXene-single-walled carbon nanotubes (SWCNTs) composites with layered heterogeneous conductive fillers and segregated structures were prepared through electrostatic flocculation and hot pressing of the PVDF composite microsphere-coated MXene and SWCNTs in a layer-by-layer fashion. Results suggest that the heterogeneous fillers improve impedance matching and layered coating, and hot compression allows the MXene and SWCNTs to form a continuous conducting network at the PVDF interface, thereby conferring excellent conductivity to the composite. The PVDF-MXene-SWCNTs composite showed a conductivity of 2.75 S cm at 2.5% MXene and 1% SWCNTs. The EMI shielding efficiency (SE) and contribution from absorption loss to the total EMI SE of PVDF-MXene-SWCNTs were 46.1 dB and 85.7%, respectively. Furthermore, the PVDF-MXene-SWCNTs composite exhibited excellent dielectric losses and impedance matching. Therefore, the layered heteroconductive fillers in a segregated structure optimize impedance matching, provide excellent conductivity, and improve absorption-dominated electromagnetic shielding.

摘要

通过结构设计改善阻抗匹配和导电性，实现了以吸收为主的电磁干扰（EMI）屏蔽。通过将聚偏氟乙烯（PVDF）复合微球包覆的MXene和单壁碳纳米管（SWCNT）进行静电絮凝和热压，以逐层方式制备了具有层状异质导电填料和隔离结构的PVDF-TiCT MXene-SWCNT复合材料。结果表明，异质填料改善了阻抗匹配和分层涂层，热压使MXene和SWCNT在PVDF界面形成连续导电网络，从而赋予复合材料优异的导电性。PVDF-MXene-SWCNT复合材料在2.5% MXene和1% SWCNT时的电导率为2.75 S cm。PVDF-MXene-SWCNT的EMI屏蔽效率（SE）和吸收损耗对总EMI SE的贡献分别为46.1 dB和85.7%。此外，PVDF-MXene-SWCNT复合材料表现出优异的介电损耗和阻抗匹配。因此，隔离结构中的层状异质导电填料优化了阻抗匹配，提供了优异的导电性，并改善了以吸收为主的电磁屏蔽。