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Double hexagonal graphene ring synthesized using a growth-etching method.

Jinyang Liu¹, Yangyang Xu, Hongbing Cai

¹College of Physics and Energy, Fujian Normal University, Fuzhou, 350117, P. R. China. jyliu@fjnu.edu.cn.

|July 9, 2016

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A novel growth-etching method synthesizes hexagonal graphene rings using dual-role oxide nanoparticles. This technique enables controlled formation of unique graphene nanostructures, including double rings, advancing materials science.

Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Precise control over graphene's structural attributes like layer number, stacking, and shape is a significant challenge in materials research.
Graphene nanostructures offer unique properties but their synthesis often lacks control over intricate details.

Purpose of the Study:

To introduce and explore a new 'growth-etching' method for synthesizing graphene rings.
To demonstrate the controlled formation of hexagonal graphene rings with specific structural features.

Main Methods:

Utilizing the chemical vapor deposition (CVD) process.
Employing oxide nanoparticles derived from annealing, which act as both nucleation sites for graphene growth and etching defects for hole formation.
Investigating the evolution of graphene ring structures over varying etching times.

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Main Results:

Successful synthesis of hexagonal graphene rings with defined exterior and interior hexagonal edges.
Demonstration of oxide nanoparticles playing a dual role in nucleation and etching.
First-time synthesis of a double hexagonal graphene ring by repeating the growth-etching process.
Observation of the graphene ring evolution process with etching time.

Conclusions:

The developed growth-etching method offers a viable approach for controlled graphene ring synthesis.
The dual-role nanoparticle strategy is effective for creating complex graphene nanostructures.
This method holds potential for scalable synthesis of multi-ring graphene structures and other unique 2D material nanostructures.