Organometallic Precursors for Use as Catalysts in Carbon Nanotube Synthesis

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• 作者：M. Sarah Mohlala ; Xin-Ying Liu ; Janine M. Robinson ; and Neil J Coville
• 刊名：Organometallics
• 出版年：2005
• 出版时间：February 28, 2005
• 年：2005
• 卷：24
• 期：5
• 页码：972 - 976
• 全文大小：341K
• 年卷期：v.24,no.5(February 28, 2005)
• ISSN：1520-6041

文摘

The synthesis of multiwalled carbon nanotubes (MWCNTs) and carbon balls (CBs)catalyzed by ferrocene (Fc), Mo(CO)₅L (L = CO, ^tBuNC), and bimetallic catalyst systems(Fc/M(CO)₅^tBuNC; M = W or Mo) was investigated. These reactions were carried out inflowing 5% H₂ in Ar in the temperature range 700-900 C. Under the reaction conditions,Fc yielded CNTs and CBs, while the M(CO)₅L complexes yielded little carbonaceous material.Depending on the temperature and weight ratio of the metals used, mixtures of Fc andM(CO)₅L generated varying amounts of CNTs and CBs. EDS and TEM analysis revealedthe formation of large particles of Mo/Fe alloys. It was observed that the diameters of theCNTs catalyzed by Fc are smaller while the diameters of CBs are larger relative to thediameters of CNTs and CBs produced by the bimetallic catalyst systems. In all instancesMWCNTs were produced, which contrasts with the single-walled CNTs produced by Fe/Mo-supported heterogeneous catalyst systems.