Strong and electrically conductive graphene-based composite fibers and laminates

Area of Science:

• Materials Science
• Nanotechnology
• Composite Materials

Background:

• Graphene possesses exceptional mechanical properties, making it ideal for lightweight, high-strength composites.
• Existing scalable graphene forms (flakes, oxides) do not fully leverage graphene's potential in composites.
• Current composite materials have limitations in mechanical strength and electrical conductivity.

Purpose of the Study:

• To produce macro-scale graphene laminates and fibers using continuous single-layer graphene sheets.
• To evaluate the mechanical and electrical performance of these novel graphene-based composite structures.
• To demonstrate the potential of continuous graphene sheets in advancing composite material capabilities.

Main Methods:

• Graphene laminates and fibers were fabricated using large, continuous sheets of single-layer graphene.
• Chemical vapor deposition (CVD) was employed to grow the continuous graphene sheets.
• Mechanical and electrical properties of the resulting composites were characterized.

Main Results:

• Macro-scale (2 inch x 2 inch) graphene laminates and fibers were successfully produced.
• Composite structures exhibited significantly enhanced mechanical properties, with estimated graphene contributions exceeding 10 GPa in strength and 1 TPa in stiffness.
• Exceptional electrical conductivities were achieved, including >8 S/cm at 0.13% graphene loading and 5 × 10^3 S/cm for pure graphene fibers.

Conclusions:

• Continuous single-layer graphene sheets enable the production of high-performance graphene composites.
• These novel graphene composites surpass the capabilities of current state-of-the-art materials in both strength and conductivity.
• The developed method offers a scalable pathway for advanced graphene-based material applications.