Journal
NANO RESEARCH
Volume 2, Issue 9, Pages 706-712Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-009-9074-z
Keywords
Graphene; solvothermal-assisted exfoliation; monolayer and bilayer; high quality
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Funding
- Beijing New Star Project of Science and Technology [2008B02]
- Ministry of Education of China
- National Basic Research Program of China [2010CB934600]
- Ministry of Science and Technology China
- Start-up Fund of Distinguished Young Scholars at Peking University
- National Nature Science Foundation of China
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Monolayer and bilayer graphene sheets have been produced by a solvothermal-assisted exfoliation process in a highly polar organic solvent, acetonitrile, using expanded graphite (EG) as the starting material. It is proposed that the dipole-induced dipole interactions between graphene and acetonitrile facilitate the exfoliation and dispersion of graphene. The facile and effective solvothermal-assisted exfoliation process raises the low yield of graphene reported in previous syntheses to 10 wt%-12 wt%. By means of centrifugation at 2000 rpm for 90 min, monolayer and bilayer graphene were separated effectively without the need to add a stabilizer or modifier. Electron diffraction and Raman spectroscopy indicate that the resulting graphene sheets are high quality products without any significant structural defects.
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