Abstract
Graphene and carbon nanotubes (CNT) are two important nanomaterials having exceptional physicochemical properties, revolutionized the entire research world and enjoyed widespread applications. Recently several efforts were made to assemble these two nanomaterials to prepare 3D hierarchical graphene-CNT hybrid with synergic properties of CNTs and graphene. The combination of 2D graphene of high charge density and 1D CNTs of large surface area generates a versatile 3D graphene-CNT hybrid network with synergic properties. Herein, we review the recent progress in the various preparation methodologies of graphene oxide (GO) -CNT and graphene-CNT hybrid nanomaterials (GO/graphene-CNT) and their characterization studies. In addition, we discussed the outstanding applications of the hybrid material in diverse fields of research including supercapacitors, dye sensitized solar cells (DSSCs), sensors, biosensors and batteries.