Effect of adding W to Fe catalyst on the synthesis of SWCNTs by arc discharge |
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| Institution: | 1. Department of Physics, Institute of Low-Dimensional Carbons and Device Physics, Shanghai University, Shanghai 200444, China;2. Department of Materials Science and Engineering, Meijo University, Nagoya 468-8502, Japan;1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China;2. Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China;3. International Centre for Quantum and Molecular Structures and Department of Physics, Shanghai University, 99 Shangda Road, Shanghai 200444, China;1. Thermodynamics Research Unit, School of Engineering, University of KwaZulu-Natal, Howard College Campus, King George V Avenue, Durban 4041, South Africa;2. MINES ParisTech – PERSEE, Rue Claude Daunesse BP 207 , 06904 Sophia Antipolis Cedex, France;1. Beijing National Laboratory of Molecular Sciences, Key Laboratory for the Physics and Chemistry of Nanodevices, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;2. Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China;1. College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, China;2. School of Chemical Engineering, Fuzhou University, Fuzhou 350108, China |
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| Abstract: | Combining iron (Fe) and tungsten (W) as a bimetallic catalyst, we synthesized high-yield single-wall carbon nanotubes (SWCNTs) of narrow diameter distribution by a hydrogen–argon arc discharge method. Raman spectra indicate that the diameters of SWCNTs prepared using the Fe–W catalysts are about 0.5 nm smaller than those using Fe catalyst alone. The transmission electron microscopy and X-ray diffraction studies show that the SWCNTs prepared by the bimetallic catalyst coexist with few graphite flakes and other amorphous carbon. At the W content of 2–4 at%, tungsten cannot be found in the SWCNT samples. Thus by using a simple two-step purification process, high-purity SWCNT samples can be obtained. We have demonstrated the growth mechanism for the high melting metal (such as W, Mo)–Fe catalyst synthesis of SWCNTs by the arc discharge method. |
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| Keywords: | Single-wall carbon nanotube Hydrogen arc discharge W–Fe catalyst |
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