Ultra-thin and highly flexible silver fractal dendrite/polyvinylidene fluoride composite film for efficient electromagnetic interference shielding

Lei，Zuomin1; Wei，Jianhong1,2; Lin，Zhiqiang1; Zhao，Tao1; Hu，Yougen1; Zhu，Pengli1; Sun，Rong1

2023-01-15

10.1016/j.cej.2022.139129

CHEMICAL ENGINEERING JOURNAL   Impact Factor & Quartile

1385-8947

1873-3212

With the electronic products move towards to flexibility, miniaturisation and high frequency, conductive polymer composites (CPCs) with ultra-low thickness, outstanding electromagnetic interference (EMI) shielding effectiveness (SE) and excellent mechanical property are urgently needed. In this work, silver fractal dendrite/polyvinylidene fluoride (AgFD/PVDF) composite films featured with double structures (defined as two-step films) were fabricated by depositing an AgFD layer followed by the incorporating of PVDF. Thanks to the 3D fractal structures of AgFDs and highly efficient conductive network, the as-prepared two-step films exhibit high electrical conductivity of 4.18 × 10 S·m at only 10 wt% AgFD loading and about 4.18 × 10 S·m at 40 wt% loading. The excellent electrically conductive property endows the two-step films to achieve remarkable EMI SE of 46.8 dB in X-band and 42.7 dB in Ka-band at 10 wt% loading with thickness of 27 μm, and 83.3 and 105.0 dB with thickness of 33 μm as the AgFD loading up to 40 wt%, respectively. The two-step films also show high near-field EMI SE values of 46.9 ∼ 61.4 dB, which fully meets the practical commercial requirements. Additionally, the two-step films possess high flexibility and mechanical strength. Considering the outstanding electrically conductive, EMI shielding performances and excellent mechanical property, the two-step composite films present a huge potential for practical applications as high-efficient EMI protection.

Electrical conductivity Electromagnetic interference shielding Mechanical property Polyvinylidene fluoride Silver fractal dendrite

SCI ; EI

English

Others

National Natural Science Foundation of China[62074154];

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000863330600003

ELSEVIER SCIENCE SA

20223712735350

Composite films ; Electric conductivity ; Electromagnetic shielding ; Electromagnetic wave interference ; Fluorine compounds ; Fractals ; Loading ; Signal interference

Materials Handling Methods:691.2 ; Electricity and Magnetism:701 ; Electricity: Basic Concepts and Phenomena:701.1 ; Electromagnetic Waves:711 ; Information Theory and Signal Processing:716.1 ; Mathematics:921

ENGINEERING

2-s2.0-85137734450

Scopus

1.Shenzhen Institute of Advanced Electronic Materials,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Lei，Zuomin,Wei，Jianhong,Lin，Zhiqiang,et al. Ultra-thin and highly flexible silver fractal dendrite/polyvinylidene fluoride composite film for efficient electromagnetic interference shielding[J]. CHEMICAL ENGINEERING JOURNAL,2023,452.

Lei，Zuomin.,Wei，Jianhong.,Lin，Zhiqiang.,Zhao，Tao.,Hu，Yougen.,...&Sun，Rong.(2023).Ultra-thin and highly flexible silver fractal dendrite/polyvinylidene fluoride composite film for efficient electromagnetic interference shielding.CHEMICAL ENGINEERING JOURNAL,452.

Lei，Zuomin,et al."Ultra-thin and highly flexible silver fractal dendrite/polyvinylidene fluoride composite film for efficient electromagnetic interference shielding".CHEMICAL ENGINEERING JOURNAL 452(2023).