Ding Ji-Heng, Zhao Hong-Ran, Yu Hai-Bin
Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.
Sci Rep. 2018 Apr 3;8(1):5567. doi: 10.1038/s41598-018-23859-5.
The unique properties of graphene are highly desired for printing electronics, coatings, energy storage, separation membranes, biomedicine, and composites. However, the high efficiency exfoliation of graphene into single- or few-layered nanoplates remains a grand challenge and becomes the bottleneck in essential studies and applications of graphene. Here, we report a scalable and green method to exfoliate graphene nanoplatelets (GNPs) from nature graphite in pure water without using any chemicals or surfactants. The essence of this strategy lies in the facile liquid exfoliation route with the assistance of vapor pretreatment for the preparation of edge hydroxylated graphene. The produced graphene consisted primarily of fewer than ten atomic layers. Such the water soluble graphene can be stored in the form of dispersion (~0.55 g L) or filter cake for more than 6 months without the risk of re-stacking. This method paves the way for the environmentally friendly and cost-effective production of graphene-based materials.
石墨烯的独特性质在印刷电子、涂料、能量存储、分离膜、生物医学和复合材料等领域具有很高的应用价值。然而，将石墨烯高效剥离成单层或几层纳米片仍然是一个巨大的挑战，并且成为石墨烯基础研究和应用的瓶颈。在此，我们报道了一种可扩展的绿色方法，无需使用任何化学物质或表面活性剂，即可在纯水中从天然石墨中剥离出石墨烯纳米片（GNP）。该策略的核心在于在蒸汽预处理的辅助下，通过简便的液体剥离路线制备边缘羟基化的石墨烯。所制备的石墨烯主要由少于十个原子层组成。这种水溶性石墨烯可以以分散液（约0.55 g/L）或滤饼的形式储存超过6个月，而不存在重新堆叠的风险。该方法为环境友好且经济高效地生产石墨烯基材料铺平了道路。
