Device-oriented graphene nanopatterning by mussel-inspired directed block copolymer self-assembly

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Graphene's unique properties make it promising for electronics, but precise nanopatterning is challenging.
• Low surface energy of pristine graphene complicates surface treatments and directed assembly.
• Existing nanopatterning methods can damage graphene's structure and electrical integrity.

Purpose of the Study:

• To develop a damage-free method for fabricating device-oriented graphene nanostructures.
• To utilize directed self-assembly of block copolymers for precise graphene patterning.
• To create ordered graphene nanoribbon arrays and graphene nanomeshes for electronic applications.

Main Methods:

• Employed directed self-assembly of block copolymers on chemical vapor deposition (CVD) grown graphene.
• Utilized mussel-inspired polydopamine as an adhesive for surface treatment.
• Applied the graphoepitaxy principle to guide the self-assembly process.
• Fabricated nanostructures between pre-patterned metal electrodes.

Main Results:

• Successfully fabricated device-oriented graphene nanostructures, including multi-channel graphene nanoribbon arrays.
• Created a graphene nanomesh structure positioned between metal electrodes.
• Demonstrated that polydopamine treatment is facile, damage-free, and complements graphene's low surface energy.
• Minimized damage to graphene's graphitic structure and electrical properties during nanopatterning.

Conclusions:

• Directed self-assembly of block copolymers, combined with polydopamine and graphoepitaxy, is an effective strategy for graphene nanopatterning.
• This approach enables the fabrication of complex graphene nanostructures with preserved material integrity.
• The developed method offers a pathway for scalable production of graphene-based electronic devices.