Flame Synthesis of Carbon Nanotubes and Nanocapsules

Abstract:

Flame synthesis of carbon nanotubes and nanocapsules is demonstrated via a pyramid-shaped pyrolysis flame. The mixture of CO, H₂, and nebulized catalyst raw material reacts in a high temperature environment formed inside the frustum of pyramid-shaped reactor heated by premixed flame of C₂H₂ and air outside. A sampling substrate inserted into the incomplete combusting flame of central reacting mixtures can gain the samples of carbon nanotubes and nanocapsules. The effect of sampling time and catalyst concentration is revealed via Field emission scanning electron microscope (FE-SEM) and High-resolution transmission electron microscopy (HR-TEM). 5-mins sampling time and 0.5/50 (Fe(CO)₅/C₂H₅OH, volume ratio) of catalyst concentration is the most appropriate for carbon nanotubes synthesis. In addition, it is to say that catalyst concentration is the most important one among all the factors that can be used to determine whether the main products are carbon nanotubes or nanocapsules, and the structures of nanocapsules are also analyzed in detail.

• Periodical: Materials Science Forum (Volume 688)
• Pages: 116-121
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.688.116
• Online since: June 2011
• Authors: Zhao Yong Ding, Bao Min Sun, Bin Jia, Xiao Lian Ding
• Keywords: Carbon Nanotube (CN), Catalyst Concentration, HR-TEM, Nanocapsule, Pyrolysis Flame, Sampling Time, SEM

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