Structure and thermal expansion of multi-walled carbon nanotubes before and after high temperature treatment

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	Structure and thermal expansion of multi-walled carbon nanotubes before and after high temperature treatment
	F. Y. Wu; H. M. Cheng
	2005
发表期刊	Journal of Physics D-Applied Physics
ISSN	0022-3727
卷号	38 期号:24 页码:4302-4307
摘要	The structure and thermal expansion of multi-walled carbon nanotubes (MWNTs) with different diameters, prepared through the catalytic decomposition of vaporized benzene, were studied by x-ray diffraction at different temperatures, combined with scanning electron microscopy, transmission electron microscopy and electron diffraction. In comparison with that of the as-grown MWNTs, decreasing d(002) and increasing L, of MWNTs after high temperature treatment (HTT) were obvious. However, the smaller the diameter of MWNTs, the more difficult the graphitization. The structural strain epsilon(c) representing the distribution of interlayer spacing increased with increasing nanotube diameter. Considering the observations of asymmetrical lattice fringe for small MWNTs and polygonization morphology for big MWNTs after HTT, the crystallite size L-c and the radial thermal expansion a, of MWNTs with different diameters were comparatively analysed in view of the energy. Presumably 50 nm may be the critical diameter for polygonization of MWNTs. Based on these facts, the mechanism of the graphitization process for MWNTs was discussed and the structure models of the MWNTs before and after HTT were suggested.
部门归属	chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.;cheng, hm (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;cheng@imr.ac.cn
关键词	Diffraction Tubes Crystals Benzene Fibers
URL	查看原文
WOS记录号	WOS:000234382800007
引用统计	被引频次：68[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35111
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	F. Y. Wu,H. M. Cheng. Structure and thermal expansion of multi-walled carbon nanotubes before and after high temperature treatment[J]. Journal of Physics D-Applied Physics,2005,38(24):4302-4307.
APA	F. Y. Wu,&H. M. Cheng.(2005).Structure and thermal expansion of multi-walled carbon nanotubes before and after high temperature treatment.Journal of Physics D-Applied Physics,38(24),4302-4307.
MLA	F. Y. Wu,et al."Structure and thermal expansion of multi-walled carbon nanotubes before and after high temperature treatment".Journal of Physics D-Applied Physics 38.24(2005):4302-4307.