Structural Changes in Iron Oxide and Gold Catalysts during Nucleation of Carbon Nanotubes Studied by In Situ Transmission Electron Microscopy

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	Structural Changes in Iron Oxide and Gold Catalysts during Nucleation of Carbon Nanotubes Studied by In Situ Transmission Electron Microscopy
	D. M. Tang; C. Liu; W. J. Yu; L. L. Zhang; P. X. Hou; J. C. Li; F. Li; Y. Bando; D. Golberg; H. M. Cheng
	2014
发表期刊	Acs Nano
ISSN	1936-0851
卷号	8 期号:1 页码:292-301
摘要	We report a simple, versatile in situ transmission electron microscopy (TEM) approach for investigating the nucleation and growth mechanism of carbon nanotubes (CNTs), by which the composition, phase transition, and physical state of various catalysts can be clearly resolved. In our approach, catalyst nanoparticles (NPs) are placed in a multiwall CNT "tubular furnace" with two open ends, and a high temperature is obtained by Joule heating in the specimen chamber of a TEM. The carbon is supplied by electron irradiation-induced injection of carbon atoms. Comparative studies on the catalytic behavior of traditional iron oxide and recently discovered gold catalysts were performed. It was found that the growth of CNTs from iron oxide involves the reduction of Fe2O3 to Fe3C, nucleation and growth of CNTs from partially liquefied Fe3C, and finally the formation of elemental Fe when the growth stops. In contrast, while changes in shape, size, and orientation were also observed for the fluctuating Au NPs, no chemical reactions or phase transitions occurred during the nucleation of CNTs. These two distinct nucleation and growth processes and mechanisms would be valuable for the structure-controlled growth of CNTs by catalyst design and engineering.
部门归属	[tang, dai-ming ; liu, chang ; yu, wan-jing ; zhang, li-li ; hou, peng-xiang ; li, jin-cheng ; li, feng ; cheng, hui-ming] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [tang, dai-ming] natl inst mat sci, icys, tsukuba, ibaraki 3050044, japan. [tang, dai-ming ; bando, yoshio ; golberg, dmitri] natl inst mat sci, world premier int wpi ctr mat nanoarchitecton man, tsukuba, ibaraki 3050044, japan. ; liu, c (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; cliu@imr.ac.cn ; golberg.dmitri@nims.go.jp
关键词	Carbon Nanotube Nucleation Growth Mechanism Catalyst In Situ Electron Microscopy Diameter-controlled Synthesis Chemical-vapor-deposition Nanoparticle Catalysts Selective Synthesis Metal-catalysts Small Particles Silicon-wafers Free Growth Aluminum Copper
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72494
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. M. Tang,C. Liu,W. J. Yu,et al. Structural Changes in Iron Oxide and Gold Catalysts during Nucleation of Carbon Nanotubes Studied by In Situ Transmission Electron Microscopy[J]. Acs Nano,2014,8(1):292-301.
APA	D. M. Tang.,C. Liu.,W. J. Yu.,L. L. Zhang.,P. X. Hou.,...&H. M. Cheng.(2014).Structural Changes in Iron Oxide and Gold Catalysts during Nucleation of Carbon Nanotubes Studied by In Situ Transmission Electron Microscopy.Acs Nano,8(1),292-301.
MLA	D. M. Tang,et al."Structural Changes in Iron Oxide and Gold Catalysts during Nucleation of Carbon Nanotubes Studied by In Situ Transmission Electron Microscopy".Acs Nano 8.1(2014):292-301.