▎ 摘　　要

NOVELTY - Coproducing carbon nanotube and graphene by decomposition at high temperature of a carbon source in a gas state, comprises contacting the carbon source with a catalyst comprising a mixture of an active catalyst-A for the synthesis of carbon nanotubes and an active catalyst-B for the synthesis of graphene. USE - The process is useful for coproducing carbon nanotube and graphene in assemble form, where the assembly of carbon nanotubes and graphene are useful in a polymer matrix for manufacturing composite materials, which are useful for manufacturing transport devices or fluid storage devices such as pipes, tanks, offshore pipes or hoses, or manufacturing compact or porous electrodes such supercapacitors or batteries, or front or back cover of an electronic device (all claimed) such as phone, computer or flat screen TV. ADVANTAGE - The process easily produces composite materials having improved electrical and/or thermal conduction properties and/or improved mechanical properties, preferably elongation resistance property. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for an assembly of carbon nanotube and graphene obtained by the process.