Structural evolution of fluorinated graphene upon molten-alkali treatment probed by X-ray absorption near-edge structure spectroscopy

Structural evolution of fluorinated graphene upon molten-alkali treatment probed by X-ray absorption near-edge structure spectroscopy
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X射线吸收近边结构光谱探测熔融碱处理氟化石墨烯的结构演化

DOI:
10.1016/j.apsusc.2017.01.190
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发表时间:
2017-05
影响因子:
6.7
通讯作者:
Jin Guo
Jin Guo
中科院分区:
材料科学1区
文献类型:
--
作者:
Xianqing Liang;Deyou Pan;Ming Lao;Shuiying Liang;Dan Huang;Wenzheng Zhou;Jin Guo

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利用X射线吸收近边结构(XANES)谱系统研究了氟化石墨烯(FG)纳米片在熔融碱处理后的结构演变。研究发现,在设计的熔碱条件下,羟基可以逐渐取代氟原子,与石墨烯片形成共价键。XANES光谱还揭示了通过取代反应后相邻羟基的分子内脱水形成环氧基团。在高碱-FG重量比下,由于环氧基团的逐渐分解,可以观察到石墨烯片中的π-共辄结构的恢复。我们的实验结果表明,羟基官能化FG(HFG)的表面化学和电子结构可以很容易地通过改变反应物的比例进行调整。
The structural evolution of fluorinated graphene (FG) nanosheets upon molten-alkali treatment has been systematically investigated utilizing X-ray absorption near-edge structure (XANES) spectroscopy. It is found that the hydroxyl groups can progressively displace fluorine atoms to form covalent bonds to the graphene sheets under designed molten-alkali condition. The XANES spectra also reveal the formation of epoxide groups through intramolecular dehydration of neighbouring hydroxyl groups after substitution reaction. At high alkali-FG weight ratio, the restoration of the π-conjugated structure in graphene sheets can be observed due to the gradual decomposition of epoxide groups. Our experimental results indicate that the surface chemistry and electronic structure of hydroxyl-functionalized FG (HFG) can be readily tuned by varying the ratio of reactants.
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