KCS

Graphene - a honeycomb-like single layer consisting of sp² hybridized carbons - has outstanding mechanical, thermal, and electrical properties as well as lightness. In order to exploit these potentials into practical applications, preparation of high-quality graphene on a large scale is an essential prerequisite. Among various strategies, chemical reduction of graphite oxide (GO) is commonly used for mass production of graphene, and numerous studies have been expended to exploring effective reduction methods by adopting many different kinds of reducing agents such as hydrazine,[1] sodium borohydride,[2] sulfuric acid,[3] and so on. However, those early reported reducing agents require stringent reduction conditions (high temperature and long time). Furthermore, insufficient affinity of reduced graphite oxide (r-GO) with various solvents especially water, hindered various application of resultant r-GO. In this presentation, we report a new reduction method where GO was readily converted to r-GO in extremely short time (less than 10 min) under ambient conditions. Besides, dispersibility and stability of r-GO are significantly improved and easily controlled without any further processes. [1]. Stankovich, S.; Dikin, D. A.; Piner, R. D.; Kohlhaas, K. A.; Kleinhammes, A.; Jia, Y.; Wu, Y.; Nguyen, S. T.; Ruoff, R. S., Synthesis of Graphene-Based Nanosheets Via Chemical Reduction of Exfoliated Graphite Oxide. Carbon 2007, 45, 1558-1565. [2]. Gao, W.; Alemany, L. B.; Ci, L. J.; Ajayan, P. M., New Insights into the Structure and Reduction of Graphite Oxide. Nat. Chem. 2009, 1, 403-408. [3]. Kim, D.; Yang, S. J.; Kim, Y. S.; Jung, H.; Park, C. R., Simple and Cost-Effective Reduction of Graphite Oxide by Sulfuric Acid. Carbon.