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Solution properties of graphite and graphene.

Sandip Niyogi¹, Elena Bekyarova, Mikhail E Itkis

¹Department of Chemistry, Center for Nanoscale Science and Engineering, University of California, Riverside, California 92521-0403, USA.

Journal of the American Chemical Society

|June 15, 2006

Summary

Oxidized graphite becomes soluble in organic solvents after derivatization with octadecylamine. This breakthrough enables the study of solution properties of single and few-layer graphene sheets.

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Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Graphite, a layered material, is typically insoluble in common solvents.
Functionalization is a key strategy to impart solubility and processability to carbon materials.

Purpose of the Study:

To develop a method for solubilizing oxidized graphite.
To characterize the resulting soluble graphene species.
To investigate the solution properties of graphite.

Main Methods:

Covalent derivatization of acidic functional groups in oxidized graphite using octadecylamine.
Solubilization in common organic solvents.
Atomic force microscopy (AFM) for characterization of soluble species.

Main Results:

Successful covalent derivatization rendered oxidized graphite soluble in organic solvents.
AFM characterization confirmed the presence of single and few-layer graphene sheets in solution.
This study reports the first observation of solution properties for graphite.

Conclusions:

Octadecylamine derivatization is an effective method to achieve solubility of oxidized graphite.
The soluble species are predominantly individual and few-layer graphene sheets.
This work opens new avenues for exploring graphite and graphene in solution-based applications.