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Synthesis of multi-walled carbon nanotubes using CoMnMgO catalysts through catalytic chemical vapor deposition |
| Yang Wen (杨文), Feng Yan-Yan (冯艳艳), Jiang Cheng-Fa (江成发), Chu Wei (储伟) |
| Department of Chemical Engineering, Sichuan University, Chengdu 610065, China |
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Abstract The CoMgO and CoMnMgO catalysts are prepared by a co-precipitation method and used as the catalysts for the synthesis of carbon nanotubes (CNTs) through the catalytic chemical vapor deposition (CCVD). The effects of Mn addition on the carbon yield and structure are investigated. The catalysts are characterized by temperature programmed reduction (TPR) and X-ray diffraction (XRD) techniques, and the synthesized carbon materials are characterized by transmission electron microscopy (TEM) and thermo gravimetric analysis (TG). TEM measurement indicates that the catalyst CoMgO enclosed completely in the produced graphite layer results in the deactivation of the catalyst. TG results suggest that the CoMnMgO catalyst has a higher selectivity for CNTs than CoMgO. Meanwhile, different diameters of CNTs are synthesized by CoMnMgO catalysts with various amounts of Co content, and the results show that the addition of Mn avoids forming the enclosed catalyst, prevents the formation of amorphous carbon, subsequently promotes the growth of CNTs, and the catalyst with decreased Co content is favorable for the synthesis of CNTs with a narrow diameter distribution. The CoMnMgO catalyst with 40% Co content has superior catalytic activity for the growth of carbon nanotubes.
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Received: 16 June 2014
Revised: 28 July 2014
Accepted manuscript online:
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PACS:
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82.33.Ya
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(Chemistry of MOCVD and other vapor deposition methods)
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61.48.De
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(Structure of carbon nanotubes, boron nanotubes, and other related systems)
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61.46.-w
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(Structure of nanoscale materials)
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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2011CB201202). |
Corresponding Authors:
Jiang Cheng-Fa, Chu Wei
E-mail: jiangcf@scu.edu.cn;chuwei1965scu@163.com
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Cite this article:
Yang Wen (杨文), Feng Yan-Yan (冯艳艳), Jiang Cheng-Fa (江成发), Chu Wei (储伟) Synthesis of multi-walled carbon nanotubes using CoMnMgO catalysts through catalytic chemical vapor deposition 2014 Chin. Phys. B 23 128201
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