Lightweight Flexible and Efficient Electromagnetic Shielding Composites Based on Silver-Coated Glass Microspheres

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Silicone rubber composites with conductive fillers are crucial for electromagnetic interference (EMI) shielding in electronics.
• Traditional metal fillers like silver in EMI shielding composites present challenges in terms of cost and density.
• Developing lightweight, high-performance EMI shielding materials is essential for advanced electronic applications.

Purpose of the Study:

• To synthesize silver-coated glass microspheres (Ag@GMs) for use in silicone rubber composites.
• To create lightweight, flexible, and highly effective EMI shielding materials.
• To evaluate the EMI shielding performance, conductivity, and stability of the developed composites.

Main Methods:

• Synthesis of Ag@GMs using an ethylene glycol activation method.
• Formulation of silicone rubber composites incorporating the synthesized Ag@GMs.
• Characterization of composite density, electrical conductivity, and EMI shielding efficiency.
• Assessment of bending resistance and aging stability.

Main Results:

• Achieved a maximum composite density of 1.83 g/cm³ and electrical conductivity of 204.63 S/cm.
• Demonstrated significant enhancement in interface polarization loss and internal reflection at the Ag@GMs core-shell interface.
• Attained a maximum electromagnetic shielding efficiency of up to 120 dB.
• Exhibited excellent bending resistance and aging stability.

Conclusions:

• The developed Ag@GMs-based silicone rubber composites offer a lightweight and effective solution for EMI shielding.
• The unique core-shell structure enhances EMI shielding performance through improved polarization and reflection mechanisms.
• These composites show significant potential for applications in wearable, smart, and precision electronic devices requiring robust EMI protection.