Solvothermal-assisted exfoliation process to produce graphene with high yield and high quality
Graphene, solvothermal-assisted exfoliation, monolayer and bilayer, high quality
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 modifi er. Electron diffraction and Raman spectroscopy indicate that the resulting graphene sheets are high quality products without any signifi cant structural defects.
Tsinghua University Press
Wen Qian,Rui Hao,Yanglong Hou,Yuan Tian,Chengmin Shen,Hongjun Gao,Xuelei Liang, Solvothermal-assisted exfoliation process to produce graphene with high yield and high quality. NanoRes.2009, 2: 706-712