Disclosed is a carbonaceous
nanocomposite including: a substrate; a
graphene sheet formed on a top surface of the substrate in parallel with the substrate; and a carbonaceous nanomaterial provided on another surface of the
graphene sheet, the nanomaterial having an
aspect ratio of 2 to 75,000 to make a predetermined angle with the
graphene sheet. The carbonaceous
nanocomposite according to the present disclosure has excellent adhesivity to the substrate and can be attached to the substrate without undergoing a pasting process. Since a two-directional current flow is generated, the electrical resistance of the graphene and
carbon nanotube is considerably reduced. In addition, the graphene allows the
carbon nanotube to have a
high current density and a high specific surface area, thereby accelerating a
redox reaction. The excellent heat-radiating property of the graphene sheet allows fast transfer of heat generated in the
carbon nanotube to outside, thereby avoiding degradation of the carbon
nanotube. Thus, when employed as an
electrode for a battery or a
field emission display, a higher
current density and an extended lifespan can be achieved when compared with the existing art.