We used a low molecular weight organic molecule, 6-amino-4-hydroxy-2-naphthalenesulphonic acid (ANS), as the electrolyte for exfoliating graphite and simultaneously modified the surface of the produced graphene sheets through π-π interactions. We confirmed the formation of functionalized graphene by X-ray diffraction, Fourier transform infrared, Raman and X-ray photoelectron spectroscopy. Transmission electron microscopy and atomic force microscopy also confirmed the formation of few-layer graphene.

These electrochemically-synthesized materials could be very useful for energy storage application as suggested by our cyclic voltammetry, charge-discharge and electrochemical impedance spectroscopy data analysis. Charge-discharge experiments have also shown that the specific capacitance of ANS functionalized graphene is 115 F g–1 at a current density of 4 A g–1.

More information can be found in the journal Nanotechnology24 365706.

Further reading

Laser beam exfoliates graphite to form chemically tunable platform (Jan 2013)
New approach to scalable nano-patterning of graphene (Nov 2011)
Scaling up graphene nanoribbons – a bioinspired solution (Sep 2009)