Multifunctional Graphene Microstructures Inspired by Honeycomb for Ultrahigh Performance Electromagnetic Interference...

Area of Science:

• Materials Science
• Nanotechnology
• Electrical Engineering

Background:

• High-performance electromagnetic interference (EMI) shielding materials are crucial for aerospace and wearable electronics.
• Existing materials often lack the desired combination of low density, flexibility, and mechanical strength.

Purpose of the Study:

• To develop and characterize a novel honeycomb porous graphene (HPG) material for advanced EMI shielding and wearable applications.
• To evaluate the EMI shielding effectiveness (SE) and mechanical properties of HPG and its composites.

Main Methods:

• Fabrication of HPG using laser scribing technology.
• Characterization of EMI shielding effectiveness (SE) and absolute shielding effectiveness per thickness (SSE/t).
• Modification of HPG with MXene and silver nanowires (AgNWs) to create composite membranes.
• Assessment of mechanical stability through cyclic stretching and bending tests.

Main Results:

• HPG achieved an EMI SE of 45 dB at 48.3 μm thickness.
• HPG demonstrated an ultrahigh SSE/t of 240,123 dB cm²/g at a density of 0.0388 g/cm³.
• HPG/AgNWs composite membrane reached an SSE/t of 292,754 dB cm²/g.
• HPG exhibited excellent mechanical stability and durability for sensing applications.

Conclusions:

• Lightweight and flexible HPG offers superior EMI shielding performance and mechanical properties.
• The material's low cost and mass production potential make it promising for practical EMI shielding and wearable electronics.
• HPG's durability and flexibility enable its use in monitoring weak physiological signals.