Magnetic-conductive bi-gradient structure design of CP/PGFF/Fe 3 O 4 composites for highly absorb e d EMI shielding and balanced mechanical strength  

作　　者：Qiang Peng Meng Ma Si Chen Yanqin Shi Huiwen He Xu Wang 

机构地区：[1]College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China [2]Key Laboratory of Plastic Modification and Processing Technology in Zhejiang Province,Hangzhou 310014,China

出　　处：《Journal of Materials Science & Technology》2023年第2期102-110,共9页材料科学技术（英文版）

基　　金：supported by the Key Research Pro-gram of Zhejiang Province(No.2020C01010);the Natural Science Foundation of Zhejiang Province(No.LY20E030008);the Na-tional Natural Science Foundation of China(No.21504078).

摘　　要：Developing excellent absorption-dominant electromagnetic interference(EMI)shielding composites is an urgent demand for the rapid development of 5 G technology and electronic equipment.Herein,a simple strategy is employed to fabricate carbon nanotubes-polypropylene fibers(CP)/polypropylene-glass fibers felt(PGFF)/Fe 3 O 4 composites with superior EMI shielding effectiveness and low reflection due to the magnetic-conductive bi-gradient structure which is naturally formed by deposition during the vacuum-assisted filtration process.The difference in dimensionality between one-dimensional CNT with outstand-ing electrical conductivity and zero-dimensional magnetic Fe 3 O 4 nanoparticles is the theoretical basis for the successful construction of the magnetic-conductive bi-gradient structure in a gap-rich PGFF matrix that endows the composites with“absorb-reflect-reabsorb”EMI shieldingmechanism.Whentheelectro-magnetic waves are incident from the magnetic layer,the EMI shielding effectiveness(SE)reaches 48.9 dB as the weight percentage of the conductive layer increases,more importantly,the reflection coefficients are reduced by more than 0.32 compared with that of another incident pattern.What’s more,the re-sultant composites exhibit an outstanding signal shielding function in the application.This work paves a convenient pathway for designing a magnetic-conductive bi-gradient structure and efficient absorbing EMI shielding composites applied in the next-generated electronic information and communication field.

关 键 词：Electromagnetic interference shielding Magnetic-conductive bi-gradient structure Absorption-dominant Dimensionality Polypropylene-glass fibers felt 

分 类 号：TB332[一般工业技术—材料科学与工程] R318.08[医药卫生—生物医学工程]