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 d...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.展开更多
基金Acknowledgements This work was supported by the National Natural Science Foundation of China （Nos. 20825208, 60736004, 20973184, 20721061, and 60911130231）, the Major State Basic Research Development Program （Nos. 2011CB808403, 2011CB932303, and 2009CB623603）, and the Chinese Academy of Sciences.
文摘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.
