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Introduction
Graphene, as a two dimensional carbon sheet with hexagonal packed lattice structure, has been shown to possess unique electronic, optical, thermal and mechanical properties. Since the successful exfoliation of graphene layers by Novoselov et al1 in 2004, interests on graphene and its chemically modified derivitives have grown significantly. Studies on their potential applications expanded to areas such as nanoelectronic devices, sensors, batteries, supercapacitors, solar cells, etc.2 The applications of graphene are hindered, however, by the low throughput in mass production and the difficulty in making large and uniform sheets by mechanical exfoliation. Consequently, alternative synthetic methods by processes such as CVD and liquid exfoliation to overcome these problems become critical for the development of successful applications.3–5 Among them, the reduction of highly oxidized graphene sheet from liquid exfoliation of graphite oxide has become of particular interest. This is because the method not only provides a promising route to mass production of graphene oxide (GO) or reduced graphene oxide (rGO) sheets, but also offers a platform for the production of a vast number of chemically modified graphene (CMG) sheets which can open the door to attractive material science applications.6–8
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