Liquid-phase exfoliation of fluorinated graphite to produce high-quality graphene sheets
Liquid-phase exfoliation of fluorinated graphite to produce high-quality graphene sheets
复制标题
氟化石墨的液相剥离生产高质量石墨烯片
DOI：
10.1116/1.5081961
复制
发表时间：
2019-05-01
影响因子：
1.4
通讯作者：
Meng, Yawen
中科院分区：
文献类型：
--
作者：
Chen, Li;Meng, Yawen
石墨的化学剥离作为一种简便的方法被用于大规模合成石墨烯片。然而，包括石墨的氧化和氧化石墨烯的还原的制备过程在所获得的石墨烯片中导致许多缺陷和不必要的含氧基团。在这项研究中，提出了一种简单易行的方法，从氟化石墨（FGi）开始制造石墨烯。采用傅里叶变换红外光谱、X射线光电子能谱和透射电子显微镜对石墨烯片的成分和结构进行了分析。结果表明，采用化学剥离法制备的石墨烯具有多晶结构，尺寸大，平整度好。通过调节反应时间，可以方便地调节F/C比，反应时间超过8h，F/C比几乎不下降。此外，本文还系统地研究了石墨烯的导电性能和电化学性能，发现其导电性能和电化学性能随F/C比的变化呈现一定的规律性。然而，包括石墨的氧化和氧化石墨烯的还原的制备过程在所获得的石墨烯片中导致许多缺陷和不必要的含氧基团。在这项研究中，提出了一种简单易行的方法，从氟化石墨（FGi）开始制造石墨烯。采用傅里叶变换红外光谱、X射线光电子能谱和透射电子显微镜对石墨烯片的成分和结构进行了分析。结果表明，采用化学剥离法制备的石墨烯具有多晶结构，尺寸大，平整度好。通过调节反应时间，可以方便地调节F/C比，反应时间超过8h，F/C比几乎不下降。此外，还对所制备的石墨烯的导电性和电化学性能进行了系统的研究。
Chemical exfoliation of graphite as a facile method is used to synthesize graphene sheets on a large scale. However, the preparation process including oxidation of graphite and reduction of graphene oxide causes many defects and unnecessary oxygen-containing groups in obtained graphene sheets. In this study, a simple and facile method is proposed to create graphene starting from fluorinated graphite (FGi). Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy were employed to analyze the components and structure of the graphene sheets. The results showed that large and flat graphene sheets with the polycrystalline structure were obtained by the chemical exfoliation of FGi. The F/C ratio can be facilely tuned just by adjusting the refluxing time, and the ratio is almost not decreased when reaction time is more than 8 h. Furthermore, the electrical conductivity and electrochemical properties of the as-prepared graphene have been systematically investigated and exhibited regularity with a variation of the F/C ratio.Chemical exfoliation of graphite as a facile method is used to synthesize graphene sheets on a large scale. However, the preparation process including oxidation of graphite and reduction of graphene oxide causes many defects and unnecessary oxygen-containing groups in obtained graphene sheets. In this study, a simple and facile method is proposed to create graphene starting from fluorinated graphite (FGi). Fourier transform infrared spectroscopy, x-ray photoelectron spectroscopy, and transmission electron microscopy were employed to analyze the components and structure of the graphene sheets. The results showed that large and flat graphene sheets with the polycrystalline structure were obtained by the chemical exfoliation of FGi. The F/C ratio can be facilely tuned just by adjusting the refluxing time, and the ratio is almost not decreased when reaction time is more than 8 h. Furthermore, the electrical conductivity and electrochemical properties of the as-prepared graphene have been systematically invest...