Changes in graphene interlayer distance induced by intercalation and quasicrystallization: a TRHEPD study

Area of Science:

• Materials Science
• Surface Science
• Condensed Matter Physics

Background:

• Graphene's properties are significantly influenced by its substrate.
• The graphene-substrate distance is crucial for determining interlayer coupling strength and material properties.

Purpose of the Study:

• To review recent findings on interlayer distance variations in graphene systems.
• To highlight the application of total-reflection high-energy positron diffraction (TRHEPD) in probing these distances.
• To explore how interface modifications affect graphene's behavior.

Main Methods:

• Utilizing total-reflection high-energy positron diffraction (TRHEPD) for high surface sensitivity.
• Analyzing graphene on metal surfaces.
• Investigating foreign atom intercalation at the graphene-substrate interface.
• Examining graphene quasicrystals.

Main Results:

• TRHEPD accurately resolves changes in graphene-substrate distance.
• Intercalation and quasicrystallization demonstrably alter the interlayer distance.
• These structural changes correlate with modifications in graphene's electronic and thermal properties.

Conclusions:

• TRHEPD is a powerful technique for understanding graphene-substrate interactions.
• Interface engineering via intercalation and quasicrystallization offers pathways to tune graphene's properties.
• Precise control over interlayer distance is key to optimizing graphene-based devices.