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	Synthesis of thin-walled carbon nanotubes from methane by changing the Ni/Mo ratio in a Ni/Mo/MgO catalyst
	Zhang Qiang ; Liu Yi ; Hu Ling ; Qian Wei-zhong ; Luo Guo-hua ; Wei Fei
	2010-10-12 ; 2010-10-12
关键词	Carbon nanotubes Chemical vapor deposition Ni/Mo/MgO DECOMPOSITION DIAMETER PROGRESS GROWTH CNTS Materials Science, Multidisciplinary
中文摘要	Thin-walled carbon nanotubes (CNTs) were prepared from methane decomposition using Ni/Mo/MgO as catalysts loaded with 1% mole fraction of Ni and smaller proportion of Mo. The relationship between CNT diameter and Ni/Mo ratio was studied by SEM, TEM, XRD and Raman spectroscopy. The particle size and the active phase of the catalyst could be modulated by the Ni/Mo ratio. With decreasing Ni/Mo ratio, a NiMo alloy was First formed, and then an isolated Mo phase was formed on the catalyst, as characterized by TEM and XRD. The NiMo alloy, with very small size, wits responsible for the growth of thin-walled CNTs, whereas, the Mo phase was related to the formation of large-diameter thick-walled CNTs. The thin-walled CNTs with outer diameter of 3.0 nm and inner diameter of 1.3 nm could be obtained with high selectivity, a narrow diameter distribution, and high purity by controlling the Ni/Mo ratio at 6. Rahman spectra confirmed the formation of thin-walled CNTs with few defects. The formation of thin-walled CNTs wits mainly attributed to it rapid surface diffusion and precipitation of carbon on the small metal alloy crystallites.
语种	英语 ; 英语
出版者	SCIENCE CHINA PRESS ; BEIJING ; 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/79553]
专题	清华大学
推荐引用方式 GB/T 7714	Zhang Qiang,Liu Yi,Hu Ling,et al. Synthesis of thin-walled carbon nanotubes from methane by changing the Ni/Mo ratio in a Ni/Mo/MgO catalyst[J],2010, 2010.
APA	Zhang Qiang,Liu Yi,Hu Ling,Qian Wei-zhong,Luo Guo-hua,&Wei Fei.(2010).Synthesis of thin-walled carbon nanotubes from methane by changing the Ni/Mo ratio in a Ni/Mo/MgO catalyst..
MLA	Zhang Qiang,et al."Synthesis of thin-walled carbon nanotubes from methane by changing the Ni/Mo ratio in a Ni/Mo/MgO catalyst".(2010).

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