Synthesis of soluble graphite and graphene

Area of Science:

• Materials Science
• Nanotechnology
• Chemistry

Background:

• Graphene, an isolated layer of graphite, is of significant interest due to its exceptional properties for electronics.
• Current methods for graphene isolation often involve physical separation or chemical oxidation, which can introduce defects.
• Oxidation processes create graphite oxide, leading to irreversible defects in the graphene basal plane.

Purpose of the Study:

• To develop efficient, oxidation-free routes for exfoliating graphite into graphene and graphitic nanoparticles.
• To preserve the intrinsic sp(2) bonding and electronic properties of graphene during exfoliation.
• To explore derivatization methods for solubilizing and manipulating graphene.

Main Methods:

• Intercalation of lithium into bulk graphite to create a reduced graphite salt.
• Reductive alkylation of the graphite salt using dodecyl groups.
• Characterization using probe microscopy to confirm covalent attachment at graphitic edges.

Main Results:

• Successful exfoliation of graphite into graphene sheets and nanoparticles without employing oxidation.
• Preservation of the sp(2) carbon network and associated electronic properties.
• Demonstration of covalent attachment of solubilizing groups exclusively at the graphitic edges.

Conclusions:

• The developed method offers an efficient route to high-quality graphene and graphitic nanoparticles.
• This approach circumvents the defect-inducing oxidation process, retaining graphene's intrinsic properties.
• The technique enables the dissolution and manipulation of graphene through edge-specific derivatization.