Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes

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	Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes
	He, MS; Wang, X; Zhang, LL; Wu, QR; Song, XJ; Chernov, AI; Fedotov, PV; Obraztsova, ED; Sainio, J; Jiang, H
刊名	CARBON
	2018-03-01
卷号	128 页码:249-256
关键词	Selective Growth Chirality Distributions Bimetallic Catalyst Xps Spectra Co Separation Mo Nanoparticles Spectroscopy Diffraction
ISSN号	0008-6223
英文摘要	The suitability of the Ni-MgO catalyst as a catalyst in chiral-selective growth of single-walled carbon nanotubes (SWNTs) by chemical vapor deposition has been assessed. It reveals that catalyst calcination temperature plays an important role in affecting the catalyst performances. Using CO as the carbon precursor and a chemical vapor deposition reaction temperature of 600 degrees C, Ni-MgO pre-calcined at 600 degrees C demonstrates the best performances in catalyzing the growth of SWNTs with predominant (6, 5) species. Systematic characterizations on catalysts calcinated at different temperatures indicate that Ni2+ ions diffuse towards the interior of MgO matrix upon annealing. DFT-based calculations reveal that the binding energy between Ni2+ and adjacent Ni(0) is larger than that between Mg2+ and Ni (0), while Ni2+ situated deep inside MgO has weak interactions with surface Ni atoms. This work highlights the importance of subsurface Ni2+ in anchoring reduced surface Ni atom, which inhibits the aggregation of Ni particles and therefore, facilitates the growth of SWNTs with a narrow chirality distribution. (c) 2017 Elsevier Ltd. All rights reserved.; The suitability of the Ni-MgO catalyst as a catalyst in chiral-selective growth of single-walled carbon nanotubes (SWNTs) by chemical vapor deposition has been assessed. It reveals that catalyst calcination temperature plays an important role in affecting the catalyst performances. Using CO as the carbon precursor and a chemical vapor deposition reaction temperature of 600 degrees C, Ni-MgO pre-calcined at 600 degrees C demonstrates the best performances in catalyzing the growth of SWNTs with predominant (6, 5) species. Systematic characterizations on catalysts calcinated at different temperatures indicate that Ni2+ ions diffuse towards the interior of MgO matrix upon annealing. DFT-based calculations reveal that the binding energy between Ni2+ and adjacent Ni(0) is larger than that between Mg2+ and Ni (0), while Ni2+ situated deep inside MgO has weak interactions with surface Ni atoms. This work highlights the importance of subsurface Ni2+ in anchoring reduced surface Ni atom, which inhibits the aggregation of Ni particles and therefore, facilitates the growth of SWNTs with a narrow chirality distribution. (c) 2017 Elsevier Ltd. All rights reserved.
学科主题	Chemistry, Physical ; Materials Science, Multidisciplinary
语种	英语
资助机构	Taishan scholarship of climbing plan [tspd20161006]; National High Technology Research and Development Program of China (863 Program) [2015AA034404]; Natural Science Foundation of Shandong Province of China [ZR2016EMM10]; Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents [2016RCJJ001]; CAS Pioneer Hundred Talent Program; Alexander von Humboldt Foundation; [RFBR-16-02-00979]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79476]
专题	金属研究所_中国科学院金属研究所
通讯作者	He, MS (reprint author), Shandong Univ Sci & Technol, Sch Mat Sci & Engn, Qingdao 266590, Peoples R China.; Ding, F (reprint author), Inst Basic Sci, Ctr Multidimens Carbon Mat, UNIST Gil 50, Ulsan 44919, South Korea.
推荐引用方式 GB/T 7714	He, MS,Wang, X,Zhang, LL,et al. Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes[J]. CARBON,2018,128:249-256.
APA	He, MS.,Wang, X.,Zhang, LL.,Wu, QR.,Song, XJ.,...&Ding, F .(2018).Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes.CARBON,128,249-256.
MLA	He, MS,et al."Anchoring effect of Ni2+ in stabilizing reduced metallic particles for growing single-walled carbon nanotubes".CARBON 128(2018):249-256.