Graphene composite using easy soluble expanded graphite: Synthesis and emission parameters

Since the carbon nanotubes (CNTs) have received a considerable attention because of their interesting properties such as high aspect ratio, electrical and thermal conductivity, and chemical and mechanical stability 1 . Various low-dimensional carbon materials have been extensively studied to explore their applications as the electron source 2,3 . Recently, graphene have attracted enormous scientific attention on account of its extraordinary electronic and mechanical properties resulting from one-atom-thick layers and hexagonally arrayed sp2-hybridized carbon atom structure. Field emission studies on graphitic sheets have become important issue from the point of view of technological applications as well as fundamental sciences 4 . So far, a few papers has been paid to field emission studies of graphene sheet (thickness 1-2 nm) 5 , synthesized via composite approach which is scalable for vacuum microelectronics and other applications, because the difficulty of graphene dispersion in solvent as well as matrix.