Investigation on the Effect of Concentration Ratio of Iron Cations on the Formation of Carbon Nanotubes Synthezied via arc Discharge in Aqueous Solution

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Gheytani, Saman | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39372 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Simchi, Abdolreza; Khomamizadeh, Farzad
Abstract:
In this work, multi-walled carbon nanotubes (MWCNTs) and single-walled carbon nanotubes (SWCNTs) were synthesized in an aqueous solution of iron chloride and solfate via arc discharge. Thermogravimetric (TG) analysis showed that the multi layer structures including carbon nanotubes (CNTs) and multi-shell graphite particles were formed when DI-water was used. SWCNTs were synthezied in the presence of the iron ions. The effect of [Fe3+]/[Fe2+] ratio on the CNTs yield were investigated. Raman spectroscopy investigations showed that the highest yield was obtained when the ferric to ferro ratio was one. When the concentration of Fe3+ ion was higher than that of Fe2+, many short tubes were obtained. The results revealed that a two-stage mechanism was involved in the CNTs nucleation and growth processes. It was suggested that the Fe3+ acted as a nucleation agent and Fe2+ as a growth agent
Keywords:
Carbon Nanotubes ; Transmission Electron Microscope ; Scanning Electron Microscopy (SEM) ; Raman Spectroscopy ; Thermogravimetry Analysis

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