Abstract
Single-walled carbon nanotubes (SWCNTs) were prepared by a modified arc discharging furnace using Fe-Ni-Mg powders as catalyst at600∘C. The effects of catalyst composition and content on the production rate and purity of SWCNTs are investigated in this paper. When the Fe-Ni-Mg catalyst composition is 2: 1: 2wt%and the catalyst content is 5wt%, the experimental results indicate that the production of SWCNTs is 12 grams per hour, and the purity and diameter of SWCNTs are70%and 1.22∼1.38 nm, respectively. The results indicate that the cooperative function of catalyst composition and content plays an important role in the production of SWCNTs. The aim of this work is to control the production process of SWCNTs efficiently.
Highlights
Since the discovery of single-walled carbon nanotubes (SWCNTs) by Iijima and Bethune in 1993 [1, 2], there has promised a new field of science and technology with their specially elongated fullerene structure
Under the fixed conditions, such as Fe-Ni-Mg powders as catalyst, the environmental temperature of 600◦C, the arc current of 100A, helium(the purity about 99.995%) as buffer gas and the pressure of 500 torr, SWCNTs were synthesized by arc discharging furnace at controlled temperature
Low content of Mg is not effective to improve the production of SWCNTs, suitable Mg content can improve the production of SWCNTs
Summary
Since the discovery of single-walled carbon nanotubes (SWCNTs) by Iijima and Bethune in 1993 [1, 2], there has promised a new field of science and technology with their specially elongated fullerene structure. A suitable catalyst and other conditions can improve the production of SWCNTs. the investigation of catalyst including its type, composition, and content is very important to control the synthesis of SWCNTs on large scale. According to previous literatures [6, 7], Fe − Ni − Mg powder as catalyst is one of the more efficient catalysts to prepare SWCNTs by arc discharging furnace at controlled temperature on large scale and high purity at present. It is necessary to carry out this research continuously and deeply so that we can commendably control the formation of SWCNTs. The aim of this work is to develop a control method which can synthesize SWCNTs on large scale and high purity so that they meet the needs of researches and applications
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