Costa Mariana C F, Marangoni Valeria S, Ng Pei Rou, Nguyen Hang T L, Carvalho Alexandra, Castro Neto A H
Centre for Advanced 2D Materials, National University of Singapore, Singapore 117456, Singapore.
Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore.
Nanomaterials (Basel). 2021 Feb 22;11(2):551. doi: 10.3390/nano11020551.
Graphene oxide (GO) is an oxygenated functionalized form of graphene that has received considerable attention because of its unique physical and chemical properties that are suitable for a large number of industrial applications. Herein, GO is rapidly obtained directly from the oxidation of graphene using an environmentally friendly modified Hummers method. As the starting material consists of graphene flakes, intercalant agents are not needed and the oxidation reaction is enhanced, leading to orders of magnitude reduction in the reaction time compared to the conventional methods of graphite oxidation. With a superior surface area, the graphene flakes are quickly and more homogeneously oxidized since the flakes are exposed at the same extension to the chemical agents, excluding the necessity of sonication to separate the stacked layers of graphite. This strategy shows an alternative approach to quickly producing GO with different degrees of oxidation that can be potentially used in distinct areas ranging from biomedical to energy storage applications.
氧化石墨烯（GO）是石墨烯的一种氧化官能化形式，因其独特的物理和化学性质适用于大量工业应用而备受关注。在此，使用环保型改良的Hummers方法直接从石墨烯氧化快速获得GO。由于起始材料由石墨烯薄片组成，不需要插层剂且氧化反应得到增强，与传统的石墨氧化方法相比，反应时间减少了几个数量级。由于石墨烯薄片具有优异的表面积，薄片以相同的程度暴露于化学试剂，因此能快速且更均匀地被氧化，无需超声处理来分离堆叠的石墨层。该策略展示了一种快速生产不同氧化程度的GO的替代方法，这些GO可潜在地用于从生物医学到能量存储应用等不同领域。
