Disintegration of graphene nanoribbons in large electrostatic fields

Area of Science:

• Materials Science
• Condensed Matter Physics
• Quantum Mechanics

Background:

• Graphene nanoribbons (GNRs) are promising materials for nanoelectronics.
• Understanding their mechanical stability under external fields is crucial for device applications.
• The influence of edge functionalization on GNR behavior is not fully understood.

Purpose of the Study:

• To investigate the deformation and disintegration of graphene nanoribbons under electrostatic fields.
• To determine the stability range and critical fracture fields of functionalized zigzag GNRs.
• To elucidate the failure mechanisms influenced by edge termination and electronic properties.

Main Methods:

• First-principle quantum mechanical calculations were employed.
• Phonon spectrum analysis was used to determine critical fracture fields.
• Various functional groups were systematically studied at zigzag edges.

Main Results:

• Different terminal groups on zigzag GNRs result in distinct fracture patterns.
• The critical fracture fields vary significantly based on the functionalization.
• Failure mechanisms involve the interplay of carbon bond alternation and terminal group electronegativity.

Conclusions:

• Edge functionalization critically influences the electrostatic stability of graphene nanoribbons.
• The findings provide insights into designing robust GNR-based electronic devices.
• Tailoring functional groups offers a pathway to control GNR mechanical failure.