Investigation on the Solfate and Chloride ion Concentration on Carbon Nanotubes Frmation Via Arc Discharge in Aqueous Solution

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Shervin, Shahab | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39371 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Simchi, Abdolreza; Khomamizade, Farzad
Abstract:
In this work, carbon nanotubes (CNTs) were synthesized via arc discharge in an aqueous solution. The role of iron catalyst in CNTs formation was investigated utilizing arc discharge in iron salts solution (Fe2(SO4)3 and FeCl3). Thermogarvimetric (TG) analysis showed the presence of multi-layered structures including multi-walled carbon nanotubes (MWCNTs) and multi-shelled graphite particles when processing was performed in DI-water. In the presence of iron ions, single-walled carbon nanotubes (SWCNTs) and double-walled carbon nanotubes (DWCNTs) were formed. The effect of iron ions (Fe3+) concentration on CNTs yield was investigated by Raman spectroscopy. The highest yield was obtained when the Fe3+ concentration was 0.05 molar. It was also found that chloride ions improved CNTs yield due to formation of fullerene-like materials. The diameter of the tubes was also smaller. It was shown that a solid-liquid-solid mechanism is involved in CNTs formation
Keywords:
Carbon Nanotubes ; Chloride Ion ; Plasma ; Raman Spectroscopy ; Electric Arc Discharge ; Fullerene Like Materials

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