Production of graphene nanospheres by annealing of graphene oxide in solution
Graphene, nanosphere, self-assembly, microwave, anneal
We report a simple method to produce graphene nanospheres (GNSs) by annealing graphene oxide (GO) solution at high-temperature with the assistance of sparks induced by the microwave absorption of graphite flakes dispersed in the solution. The GNSs were formed by rolling up of the annealed GO, and the diameters were mostly in the range 300–700 nm. The GNS exhibited a hollow sphere structure surrounded by graphene walls with a basal spacing of 0.34 nm. Raman spectroscopy and X-ray photoelectron spectroscopy of the GNSs confirmed that the GO was efficiently reduced during the fabrication process. The resulting GNSs may open up new opportunities both for fundamental research and applications, and this method may be extended to the synthesis of other nanomaterials and the fabrication of related nanostructures.
Tsinghua University Press
Jian Zheng,Hongtao Liu,Bin Wu,Yunlong Guo,Ti Wu,Gui Yu,Yunqi Liu,Daoben Zhu, Production of graphene nanospheres by annealing of graphene oxide in solution. NanoRes.2011, 4(7): 705–711