2. History of synthesis of GO and structure

Graphene is a two-dimensional (2D) carbon sheet having sp<sup>2</sup> hybridization with molecular weights of more than 106–107 g/mol. It has been packed into a honeycomb lattice (Figure 1). The bulk material of graphite that was discrete in single monolayer sheets showed noteworthy properties and hence its single monolayer structure motivated in various applications. The exfoliation of graphene oxide was synthesized by using strong oxidizing agents such as KMnO4 and conc. H2SO4 [2, 3].
