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Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
Published on: July 17, 2019
High quality graphene with large flakes exfoliated by oleyl amine
Jian Zheng1, Chong-an Di, Yunqi Liu
1Beijing National Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Chemical Communications (Cambridge, England)
|July 2, 2010
Summary
Large graphene flakes up to 300 micrometers squared were produced from graphite using oleyl amine and solvothermal methods. This process yields high-quality, defect-free monolayer graphene dispersions at high concentrations, preventing re-aggregation.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Graphene, a single layer of carbon atoms, possesses remarkable properties.
- Efficient exfoliation of large-flake graphene remains a challenge.
- Controlled synthesis of high-quality graphene is crucial for advanced applications.
Purpose of the Study:
- To develop a method for exfoliating large-flake graphene membranes.
- To achieve high-quality, defect-free graphene sheets.
- To create stable, high-concentration graphene dispersions.
Main Methods:
- Utilizing oleyl amine as a surfactant.
- Employing solvothermal conditions for graphite exfoliation.
- Characterizing graphene flake size, quality, and concentration.
Main Results:
- Successfully exfoliated large-flake graphene membranes up to 300 micrometers squared.
- Produced high-quality graphene sheets with minimal defects.
- Achieved a high concentration of 0.15 mg ml(-1) in graphene dispersions, predominantly monolayer.
- Demonstrated stability of the graphene dispersion against re-aggregation.
Conclusions:
- Oleyl amine-assisted solvothermal exfoliation is an effective method for producing large-flake, high-quality graphene.
- The developed method yields stable, high-concentration monolayer graphene dispersions.
- This approach offers potential for scalable graphene production for various applications.
