Facile synthesis and spectroscopic characterization of fluorinated graphene with tunable C/F ratio via Zn reduction
Facile synthesis and spectroscopic characterization of fluorinated graphene with tunable C/F ratio via Zn reduction
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通过锌还原实现可调节 C/F 比的氟化石墨烯的简便合成和光谱表征
DOI：
10.1016/j.apsusc.2016.12.211
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发表时间：
2017-04-01
影响因子：
6.7
通讯作者：
Guo, Jin
中科院分区：
文献类型：
--
作者：
Liang, Xianqing;Lao, Ming;Guo, Jin
采用n -甲基-2-吡咯烷酮（NMP）液相剥离氟化石墨（FGi），再用锌粉还原，制备了可调C/F比的氟化石墨烯（FG）纳米片。利用x射线光电子能谱（XPS）、x射线吸收近边结构能谱（XANES）和拉曼光谱研究了FG的表面组成和电子结构的演变。结果表明，不同的反应时间和加入稀释的HCl溶液，锌还原可以很容易地改变FG的C/F原子比。XPS和XANES结果均表明，锌处理FG后，共价C-F键有效去除，sp(2) -杂化结构逐步恢复。拉曼测量进一步表明，Zn还原可以有效地恢复pi电子共轭电子结构，减小FG的光隙。该研究提供了一种简单有效的方法来定制FG的表面组成和电子结构，以用于潜在的应用。(C) 2016 Elsevier B.V.版权所有
A facile approach has been developed to synthesize fluorinated graphene (FG) nanosheets with tunable C/F ratio through liquid-phase exfoliation of fluorinated graphite (FGi) in N-methyl-2-pyrrolidone (NMP) and subsequent reduction with Zn powder. The evolution of surface composition and electronic structure of FG is investigated by X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge structure (XANES) spectroscopy and Raman spectroscopy. It is shown that the C/F atomic ratio of FG can be easily varied by Zn reduction with different reaction time and addition of diluted HCl solution. Both XPS and XANES results indicate the effective removal of covalent C-F bonds and progressive restoration of sp(2) -hybridized structure upon the treatment of FG with Zn. Raman measurements further reveal that Zn reduction can effectively restore the pi-electron conjugated electronic structure and reduce the optical gap of FG. This study provides a simple and effective route to tailor the surface composition and electronic structure of FG for potential applications. (C) 2016 Elsevier B.V. All rights reserved.