Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication

石墨烯 剥脱关节 超声 材料科学 石墨 色散(光学) 环境友好型 纳米技术 试剂 臭氧 化学工程 复合材料 有机化学 化学 生态学 工程类 物理 光学 生物
作者
Lin Zhao,Paneer Selvam Karthik,Masaki Hada,Takeshi Nishikawa,Yûji Hayashi
出处
期刊:Nanomaterials [Multidisciplinary Digital Publishing Institute]
卷期号:7 (6): 125-125 被引量:48
标识
DOI:10.3390/nano7060125
摘要

Owing to its unique properties, graphene has attracted tremendous attention in many research fields. There is a great space to develop graphene synthesis techniques by an efficient and environmentally friendly approach. In this paper, we report a facile method to synthesize well-dispersed multilayer graphene (MLG) without using any chemical reagents or organic solvents. This was achieved by the ozone-assisted sonication of the natural graphite in a water medium. The frequency or number of ozone treatments plays an important role for the dispersion in the process. The possible mechanism of graphene exfoliation and the introduction of functional groups have been postulated. The experimental setup is unique for ozone treatment and enables the elimination of ozone off-gas. The heat generated by the dissipation of ultrasonic waves was used as it is, and no additional heat was supplied. The graphene dispersion was stable, and no evidence of aggregation was observed---even after several months. The characterization results show that well-dispersed MLG was successfully synthesized without any significant damage to the overall structure. The graphene obtained by this method has potential applications in composite materials, conductive coatings, energy storage, and electronic devices.
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