Polyvinylidene Fluoride Core-Shell Nanofiber Membranes with Highly Conductive Shells for Electromagnetic Interference...

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Increasing demand for wireless devices necessitates advanced electromagnetic interference (EMI) shielding solutions.
• Existing EMI shielding materials often lack flexibility, are heavy, or require conductive fillers.
• Lightweight, flexible materials with high EMI shielding effectiveness (SE) are crucial for diverse applications.

Purpose of the Study:

• To fabricate and evaluate a novel conducting polymer nanofiber-based EMI shielding material.
• To achieve high EMI SE using a core-shell nanofiber structure without composite fillers.
• To demonstrate the material's flexibility, durability, and hydrophobicity for practical use.

Main Methods:

• Fabrication of polyvinylidene fluoride (PVDF) core-shell nanofibers via electrospinning.
• Application of a highly conductive shell using chemical polymerization (PEDOT).
• Characterization of EMI shielding effectiveness (SE) in the X-band.

Main Results:

• Developed a lightweight, flexible EMI shielding material with a SE of ~40 dB in the X-band.
• Achieved a high absolute shielding effectiveness (SSEt) of 16,230 dB·cm²/g at 14 μm thickness.
• The nanofiber structure enhanced EMI absorption and multi-reflection, improving SE.
• The material exhibited high durability and hydrophobicity.

Conclusions:

• The developed PVDF/PEDOT core-shell nanofiber membrane is a highly effective, flexible, and lightweight EMI shielding material.
• The intrinsic conductivity of the shell eliminates the need for conductive fillers, preserving nanofiber properties.
• The material's properties make it suitable for demanding applications in wireless technology and beyond.