Mass production of high-quality multi-walled carbon nanotube bundles on a Ni/Mo/MgO catalyst |
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Authors: | Y Li XB Zhang XY Tao WZ Huang ZQ Luo F Liu HJ Geise |
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Affiliation: | a State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University; Hangzou 310027, PR China b Material Physics and Microstructure Institute, Department of Materials Science and Engineering, Zhejiang University, Hangzou 310027, PR China c University of Antwerpen (UIA), Department Chemistry, Universiteitsplein 1, B-2610 Wilrijk, Belgium |
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Abstract: | A new catalyst (Ni/Mo/MgO) is reported, with which one can synthesize multi-walled carbon nanotube (MWNT) bundles with a yield of more than 45 times the amount of the pristine catalyst, using a methane-hydrogen mixture as precursor. Powder X-ray diffraction, Raman spectroscopy and thermal gravimetric analysis show that the purity of the as-prepared MWNTs is over 97%. The diameter of the carbon nanotubes is 9-20 nm, measured by high-resolution electron microscopy on 421 individual MWNTs. The high purity of the as-prepared MWNTs allows us to omit the usual complex purification process required for carbon nanotubes synthesized by chemical vapor deposition. Because of its durable high activity, the Ni/Mo/MgO catalyst in its pristine state is ideal for mass production of high-quality MWNTs. The synergism of nickel and molybdenum is considered the main reason for the high yield of carbon nanotubes. |
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Keywords: | A Carbon nanotubes B Chemical vapor deposition Catalyst |
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