Controlled synthesis of Co2C nanochains using cobalt laurate as precursor: Structure, growth mechanism and magnetic properties

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	Controlled synthesis of Co2C nanochains using cobalt laurate as precursor: Structure, growth mechanism and magnetic properties
	Zhang, YJ; Zhu, Y; Wang, KJ; Li, D; Wang, DP; Ding, F; Meng, D; Wang, XL; Choi, C; Zhang, ZD
刊名	JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
	2018-06-15
卷号	456 页码:71-77
关键词	Carbide Nanoparticles Fe5c2 Nanoparticles Chemical-synthesis High Coercivity In-situ Carbon Phase Nanorods Nanowires Films
ISSN号	0304-8853
英文摘要	Cobalt carbides (Co2C and Co3C) nanocomposites exhibit interesting hard magnetic property, controlled synthesis of individual phase facilitates to clarify the magnetism of each, but it is difficult to obtain the single phase. We present a new approach to address this issue via a polyol refluxing process, using cobalt laurate as the precursor. The single phase Co2C magnetic nanochains self-assembled by nanoparticles are synthesized. The precursor is the key factor for controlling the growth kinetics of the Co2C nanochains. Cobalt, instead of cobalt carbides, is produced if cobalt chloride, acetate and acetylacetonate replace cobalt laurate as the precursor, respectively. The evolution of the growth process has been studied. In the formation of Co2C, first fcc-Co produces, then it transforms into Co2C by carbon diffusion process, and the produced carbon first exists in disordered state and then a small amount of them transforms into graphite. Saturation magnetization (Ms) of Co2C nanochains obtained at 300 degrees C for 20, 60, and 180 min are 27.1, 18.9, and 10.9 emu g(-1), respectively. The decrease of Ms caused by increasing carbon content, and the carbon content are much larger than the stoichiometric ratio value of Co2C (9.2 wt%). The Co2C nanochains have mesoporous pore of 3.8 nm and the specific surface area of 48.6 m(2) g(-1). (C) 2018 Elsevier B.V. All rights reserved.; Cobalt carbides (Co2C and Co3C) nanocomposites exhibit interesting hard magnetic property, controlled synthesis of individual phase facilitates to clarify the magnetism of each, but it is difficult to obtain the single phase. We present a new approach to address this issue via a polyol refluxing process, using cobalt laurate as the precursor. The single phase Co2C magnetic nanochains self-assembled by nanoparticles are synthesized. The precursor is the key factor for controlling the growth kinetics of the Co2C nanochains. Cobalt, instead of cobalt carbides, is produced if cobalt chloride, acetate and acetylacetonate replace cobalt laurate as the precursor, respectively. The evolution of the growth process has been studied. In the formation of Co2C, first fcc-Co produces, then it transforms into Co2C by carbon diffusion process, and the produced carbon first exists in disordered state and then a small amount of them transforms into graphite. Saturation magnetization (Ms) of Co2C nanochains obtained at 300 degrees C for 20, 60, and 180 min are 27.1, 18.9, and 10.9 emu g(-1), respectively. The decrease of Ms caused by increasing carbon content, and the carbon content are much larger than the stoichiometric ratio value of Co2C (9.2 wt%). The Co2C nanochains have mesoporous pore of 3.8 nm and the specific surface area of 48.6 m(2) g(-1). (C) 2018 Elsevier B.V. All rights reserved.
学科主题	Materials Science, Multidisciplinary ; Physics, Condensed Matter
语种	英语
资助机构	National Nature Science Foundation of China [51301114, 51371175, 51601120, 61403263, 21201123, 21203125]; Natural Science Foundation of Liaoning Province [201602598, 2015020649]; Science Research Foundation of Education Department of Liaoning Province [LQ2017011, L2016003]; Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science; FP7 Information and Communication Technologies and Future Planning [2016M3D1A1027800]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79287]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zhang, YJ (reprint author), Shenyang Univ Chem Technol, Coll Chem Engn, St 11, Shenyang 110142, Liaoning, Peoples R China.; Li, D (reprint author), Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, YJ,Zhu, Y,Wang, KJ,et al. Controlled synthesis of Co2C nanochains using cobalt laurate as precursor: Structure, growth mechanism and magnetic properties[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2018,456:71-77.
APA	Zhang, YJ.,Zhu, Y.,Wang, KJ.,Li, D.,Wang, DP.,...&Li, D .(2018).Controlled synthesis of Co2C nanochains using cobalt laurate as precursor: Structure, growth mechanism and magnetic properties.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,456,71-77.
MLA	Zhang, YJ,et al."Controlled synthesis of Co2C nanochains using cobalt laurate as precursor: Structure, growth mechanism and magnetic properties".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 456(2018):71-77.