Nano-fiber or nanofibers carbon that stands for it, CNN F (CNFs) is said to be. the fibers of the carbon nanotubes grown with steam (VGCFs) are formed nanostructures, cylindrical, consisting of layers of graphene, etc. structural funnel like, he cups or page, will produce. Carbon nanofibers with graphene layers wrapped in cylindrical lead to the formation of carbon nanotubes.