Scaled-up process for producing longer carbon nanotubes and carbon cotton by macro-spools

A scaled up process of the longer carbon nanotube synthesis is reported. The developed suspended-bed synthesis rig is capable of producing carbon nanotube cotton in spools or piles in kilogram amounts. A possibility to produce free-standing non-woven nanotube thin films is demonstrated. The embryonation and initial growth periods are recorded. The carbon nanotube cotton was investigated by electron microscopy (SEM/TEM), Raman spectroscopy and thermal analysis. It was shown that the material is dominated by double-walled nanotubes. Opportunities of combing, roving and spinning the carbon nanotube cotton are discussed. In conclusion this successful scale-up development paves the way for intensification of the development in macroscopic carbon nanotube-based fibers and composite materials.