Abstract

A fast method for the synthesis of graphene oxide directly from a graphitic material via a one-step mechanochemical process without adding solvent, acid or oxidizing agents, is presented. Chemical, structural and morphological characterization of such material was carried on by Raman, FT-IR and UV/vis spectroscopies, Atomic Force Microscopy, X-ray Diffraction, Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy. Functional groups present in the material are similar to those of materials produced via methods related to that of Hummers or by mechanical milling. Although its interlayer spacing is lower than in the former, it allowed its exfoliation via sonication. Oxygen content of up to 11.1% is comparable to what is reported for materials synthesized by mechanical milling, nevertheless, this process was carried on in less time and without using added oxidizing agents or inert atmospheres. This oxidation is achieved decreasing rotational speed (1060 rpm) but increasing the degrees of freedom (5) of milling jars. When comparing against past reports, it is evident that degrees of freedom affects reaction times more than rotational speed.

摘要

提出了一种通过一步机械化学过程直接从石墨材料直接合成氧化石墨烯而无需添加溶剂，酸或氧化剂的快速方法。通过拉曼光谱，FT-IR和UV / vis光谱，原子力显微镜，X射线衍射，扫描电子显微镜和能量色散X射线光谱对这种材料进行化学，结构和形态表征。材料中存在的官能团类似于通过与悍马相关的方法或通过机械研磨生产的材料。尽管其层间间距小于前者，但它允许通过声波剥离。氧含量高达11.1％，与通过机械研磨合成的材料所报告的氧含量相当，此过程无需使用添加的氧化剂或惰性气氛即可在更短的时间内完成。这种氧化是通过降低旋转速度（1060 rpm）来实现的，但可以提高铣削罐的自由度（5）。与过去的报告进行比较时，很明显自由度对反应时间的影响大于转速。