The growth mechanism of carbon nanotubes from thermal cracking of acetylene over nickel catalyst supported on alumina

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• 作者：Mo ; Y.H. ; Kibria ; A.K.M.F. ; Nahm ; K.S.
• 关键词：Carbon nanotube ; Nickel tip ; Mass spectrum ; Growth mechanism
• 刊名：Synthetic Metals
• 出版年：2001
• 期刊代码：77_03796779
• 类别：ph
• 出版时间：June 1, 2001
• 卷：122
• 期：2
• 页码：443-447
• 文件大小：168 K

摘要

Carbon nanotubes (CNTs) were grown on Ni/Al₂O₃ catalyst by thermal cracking of C₂H₂/H₂(N₂) at 600°C for 30min with a gas flow rate of 10/100sccm. The Ni/Al₂O₃ catalyst was prepared by mechanically mixing fine Ni and α-Al₂O₃ powders. The growth of CNTs in C₂H₂/H₂ medium is higher than that in C₂H₂/N₂ medium. The grown CNTs is a mixture of single-wall carbon nanotubes (SWNTs) and multi-wall carbon nanotubes (MWNTs). The gas-phase reaction was studied by analyzing gas species generated from the cracked C₂H₂/H₂ (N₂) media during the CNTs growth. C₂H₂ is not decomposed in gas-phase even at the growth temperature 600°C, but is catalytically dissociated on the Ni surface to produce a reactive carbonic species. The growth mechanism of CNTs was intensively discussed in detail in this paper based on the experimental observations.