National University of Singapore

Junzhong Wang

Kian Ping Loh

Gordon Chiu

Methods of forming graphene by graphite exfoliation, wherein the methods include: providing a graphite sample having atomic layers of carbon; introducing a salt and a solvent into the space between the atomic layers; expanding the space between the atomic layers using organic molecules and ions from the solvent and the salt; and separating the atomic layers using a driving force to form one or more sheets of graphene; the graphene produced by the methods can be used to form solar cells, to perform DNA analysis, and for other electrical, optical and biological applications.

Methods of forming graphene by graphite exfoliation

Processes for forming expanded hexagonal layered minerals (HLMs) and derivatives thereof using electrochemical charging are disclosed. The process includes employing HLM rocks () as electrodes () immersed in an electrolytic slurry () that includes an organic solvent, metal ions and expanded HLM (). The electrolysis introduces organic solvent and ions from the metal salt from the slurry into the interlayer spacings that separate the atomic interlayers of the HLM rock, thereby forming 1-stage charged HLM that exfoliates from the HLM rock. The process includes expanding the electrochemically 1-stage charged HLM by applying an expanding force.

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Singapore, Singapore

Junzhong Wang