1. Two-step splitting the expandable graphite for few-layer graphene
- Author
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Liao, Kaiming, Ding, Wangfeng, Qin, Yuyuan, Li, Zhaoguo, Chen, Taishi, Wan, Jianguo, Song, Fengqi, Han, Min, Wang, Guanghou, and Zhou, Jianfeng
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics - Abstract
Few-layer graphene sheets are prepared by splitting the expanded graphites using a high-power sonication. Atomic-level quantitative scanning transmission electron microscopy (Q-STEM) is employed to carry out the efficient layer statisticsm, enabling global optimization of the experimental conditions. A two-step splitting mechanism is thus revealed, in which the mean layer number was firstly reduced to less than 20 by heating to 1100{\deg}C and then tuned to the few-layer region by a 5-minute 104W/litre sonication. Raman spectroscopic analysis confirms the above mechanism and demonstrates that the sheets are largely free of defects and oxides.
- Published
- 2010