Graphene oxide: the mechanisms of oxidation and exfoliation
Graphene oxide: the mechanisms of oxidation and exfoliation
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DOI：
10.1007/s10853-012-6294-5
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发表时间：
2012-05-01
影响因子：
4.5
通讯作者：
Wu, Qilin
中科院分区：
文献类型：
--
作者：
Shao, Guilin;Lu, Yonggen;Wu, Qilin
采用一种改进的Hummers法制备了大片状、芳香结构更加完善的氧化石墨烯。我们证明了石墨不需要像Hummers方法中描述的那样深度氧化，因为当氧化进行到一定程度时，空间距离几乎没有增加，并且所获得的石墨氧化物（GTO）可以完全剥离成具有高热稳定性的单层。通过热重分析、傅里叶变换红外光谱、X射线光电子能谱和拉曼光谱等分析手段，对氧化石墨烯氧化过程中官能团的变化进行了分析，提出了氧化石墨烯的氧化机理和化学结构模型。分子动力学模拟计算的层间距与X射线衍射结果相吻合。此外，还研究了颗粒的粒度分布和厚度。结果证实，通过改进的方法制备的石墨烯被完全剥离成均匀的单层，并且该方法对于GTO到GO的高效剥离和石墨烯的大规模生产可能是重要的。
Graphene oxides (GOs) with large sheets and more perfect aromatic structure were prepared by a novel modified Hummers method. We demonstrated that the graphite did not need to be oxidized to such a deep degree as described in Hummers method because the space distance increased little when the oxidation proceeded to a certain extent and the obtained graphite oxides (GTOs) could be fully exfoliated to single layers with high thermal stability. The oxidation mechanism and chemical structure model of GO were proposed by analyzing the evolution of the functional groups with oxidation proceeded based on thermogravimetric analysis, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. The layer spacing calculated by molecular dynamics simulations coincided with the X-ray diffraction results. Furthermore, the size distribution and thickness of GOs were also studied. The results confirmed that the GOs prepared by the modified method were fully exfoliated to uniform single layers, and this method may be important for efficient exfoliation of GTO to GO and large-scale production of graphene.