Citation:
WU Xia, WANG Lu-Xiang, LIU Lang, JIA Dian-Zeng. Controllable Preparation of Carbon Nanotubes from Xinjiang Coal[J]. Chinese Journal of Inorganic Chemistry,
;2013, 29(9): 1842-1848.
doi:
10.3969/j.issn.1001-4861.2013.00.292
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Carbon nanotubes (CNTs) were synthesized by direct current arc discharge using three different types of coal (Dahuangshan, Heishan, Kuche) from Xinjiang, and the effects of coal species, currents, pressures, catalysts and atmospheres on the yield and morphologies of CNTs were investigated. The starting material, i.e., coal, was investigated by thermogravimetry and X-ray diffraction. In addition, the composition of the three types of coal was tested by industrial analysis and elemental analysis. The CNT samples obtained under different synthesis conditions were studied by field-emission scanning electron microscopy, high resolution transmission electron microscopy and Raman spectroscopy. Based on the analyses of different starting coal, catalysts and synthesis atmospheres, it was found that the highest yield of CNTs was obtained using Kuche coal with 12% mixture of the nickel and ferrous sulfide, and the CNTs obtained under argon have a more uniform structure. The average diameter of CNTs obtained under argon, nitrogen and helium decrease successively. The results showed that the structure and the diameter distribution of CNTs varied with different gases used during synthesis. The mechanism on the formation of different structural CNTs was discussed.
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Keywords:
- coal;DC arc discharge;carbon nanotubes
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