'Graphenization' of 2D simple monatomic liquids.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Computational Chemistry

Background:

• The formation mechanisms of 2D materials with honeycomb structures from liquid or vapor phases are not well understood.
• Real-world 2D materials like graphene, silicene, and germanene possess honeycomb lattices, crucial for their unique properties.

Purpose of the Study:

• To simulate and analyze the formation process of 2D honeycomb structures from monatomic liquids.
• To investigate the thermodynamics and structural properties of these forming 2D materials under various cooling rates.

Main Methods:

• Molecular dynamics (MD) simulations were employed to model the cooling of 2D monatomic liquids with a honeycomb interaction potential.
• Analysis included thermodynamic assessments, radial distribution functions (RDF), coordination numbers, and ring distributions.

Main Results:

• Both amorphous and crystalline honeycomb structures were observed, dependent on the cooling rate.
• Polycrystalline structures and novel structural defects were identified.
• The atomic-level mechanisms involving 6-fold rings and specific coordination numbers during solidification were elucidated.

Conclusions:

• This study provides a fundamental understanding of 2D honeycomb material formation from the liquid phase.
• The findings offer valuable insights into the structure and thermodynamics relevant to real 2D materials like graphene and silicene.