Engineering of High-Density Thin-Layer Graphite Foam-Based Composite Architectures with Superior Compressibility and...

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Three-dimensional (3D) graphene architectures are promising for flexible electronics.
• Existing 3D graphene materials suffer from brittleness, non-uniformity, and limited scalability.

Purpose of the Study:

• To develop a scalable technique for producing thin-layer graphite foam (GF).
• To fabricate GF-polymer composites for enhanced mechanical and electromagnetic properties.
• To evaluate the potential of these composites in flexible electronic devices.

Main Methods:

• Template-directed thermal annealing of polyacrylonitrile to create GF with controlled densities.
• Integration of GF with poly(dimethylsiloxane) (PDMS) to form GF@PDMS composites.
• Characterization of mechanical, electrical, thermal, and electromagnetic interference (EMI) shielding properties.

Main Results:

• Scalable production of GF with densities from 27.2-69.2 mg cm⁻³.
• GF@PDMS composites with variable GF content (15.9-31.7%) exhibited improved compressive strength (254% increase at 15.9% GF).
• Superior compressibility (95% recovery after first cycle, 88% after 1000 cycles at 80% strain) and high electrical conductivity (up to 34.3 S m⁻¹).
• Excellent EMI shielding effectiveness (up to 36.1 dB) across a broad frequency range (8.2-18 GHz).

Conclusions:

• The developed GF@PDMS composites offer a scalable solution for creating robust, flexible materials.
• These materials demonstrate significant potential for high-performance electromagnetic wave absorption in flexible electronic applications.
• The synergistic effects between GF and PDMS enhance mechanical and functional properties.