High-power splitting of expanded graphite to produce few-layer graphene sheets |
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Authors: | Kaiming Liao Wangfeng Ding Bo Zhao Zhaoguo Li Fengqi Song Yuyuan Qin Taishi Chen Jianguo Wan Min Han Guanghou Wang Jianfeng Zhou |
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Affiliation: | National Lab of Solid State Microstructures, Nanjing University, 210093 Nanjing, PR China |
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Abstract: | Few-layer graphene sheets were prepared by splitting expanded graphite using high-power sonication. Atomic-level calibrated scanning transmission electron microscopy was used to obtain efficient layer statistics, enabling optimization of the experimental conditions. This resulted in a two-step splitting mechanism in which the mean number of layers was first reduced to less than 20 by heating to 1100 °C and then to a few-layer region by a 5-min 104 W L−1 – power-density sonication. Raman spectroscopic analysis confirms the above mechanism and demonstrates that the sheets are largely free of defects and functional groups. |
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