Evenly transferred single-layered graphene membrane assisted by strong substrate adhesion

Area of Science:

• Materials Science
• Surface Science
• Nanotechnology

Background:

• Graphene transfer is crucial for fabricating 2D electronic devices.
• Substrate adhesion plays a vital role in the successful transfer of single-layered graphene membranes.
• Understanding adhesion forces is key to optimizing transfer processes.

Purpose of the Study:

• To investigate the influence of substrate adhesion on single-layered graphene membrane transfer.
• To elucidate the role of chemical bonding in enhancing adhesion forces.
• To determine optimal substrate conditions for graphene transfer and dielectric layer deposition.

Main Methods:

• Experimental measurement of adhesion forces on different substrates.
• Utilizing silicon dioxide (SiO2) as a substrate.
• Density functional theory (DFT) calculations to verify chemical bonding.
• Assessing graphene transfer and dielectric layer deposition quality.

Main Results:

• A larger adhesion force was observed on the SiO2 substrate compared to van der Waals contributions alone.
• Density functional theory calculations confirmed the presence of chemical bonding contributing to the strong adhesion.
• Optimal graphene transfer and dielectric layer deposition were achieved on the SiO2 substrate with higher adhesion.

Conclusions:

• Chemical bonding significantly enhances substrate adhesion for graphene transfer.
• The selection and modification of substrates are critical for efficient transfer of graphene and other 2D materials.
• SiO2 is a promising substrate for improved graphene transfer processes.