Graphene is an allotrope of carbon which is the basic structural unit of other allotropic forms of carbon, viz., graphite, carbon nanotubes and fullerenes. Structurally, it is a flat monolayer of carbon atoms with honeycomb lattice, which can be wrapped up into 0D fullerenes, rolled into 1D nanotubes or stacked into 3D graphite. The 2010 Nobel Prize in Physics was jointly awarded to Andre Geim and Konstantin Novoselov for their revolutionary work on graphene, which implies its potential impact in future nanotechnology. Graphene is known to be a zero bandgap semiconductor material, therefore the Fermi level can be altered to form n-doped or p-doped material through simple physicochemical processes. Owing to its interesting properties, graphene is being used in various applications including supercapacitors, transistors, electrode materials, display screens, chemical sensors, membranes, etc.