Characterization and magnetic properties of carbon-coated cobalt nanocapsules synthesized by the chemical vapor-condensation process
文献类型：期刊论文
| 作者 | Z. H. Wang ; C. J. Choi ; B. K. Kim ; J. C. Kim ; Z. D. Zhang |
| 刊名 | Carbon
 |
| 出版日期 | 2003 |
| 卷号 | 41期号:9页码:1751-1758 |
| 关键词 | carbon composites crystal structure chemical vapor deposition magnetic properties transmission electron microscopy fe-co(c) nanocapsules arc-discharge co particles nanoparticles fe methane ni nickel |
| ISSN号 | 0008-6223 |
| 中文摘要 | Carbon-coated cobalt nanocapsules were synthesized by the chemical vapor-condensation process with cobalt carbonyl (Co-2(CO)(8)) used as precursor and carbon monoxide (CO) as carrier gas. The characterization and magnetic properties of carbon-coated cobalt nanocapsules were investigated systematically. The transmission electron microscope (TEM) images showed that the as-prepared nanoparticles consist of a metal core and an amorphous carbon shell. X-ray diffraction and TEM selected area diffraction revealed the presence of f.c.c. Co phase, h.c.p. Co phase, and minority Co2C, Co3C phases. The saturation magnetization at room temperature of the nanocapsules is 146.9 Am-2 kg(-1), which is 90% of the bulk ferromagnetic element counterpart. The coercive force at room temperature of the nanocapsules is 0.12 T, while the ratio of remnant to saturation magnetization Mr/M-s is about 0.4. The saturation magnetization and the coercive force increase with increasing the decomposition temperature, mainly due to the increase of the size of the magnetic particles. The decomposition of the cobalt carbonyl (Co-2(CO)(8)) and CO gas can decrease efficiently the oxygen content in nanocapsules. The metallic Co nanoparticles completely coated by carbon can resist the dilute acid erosion as well as the oxidation. The thermal stability of the Co nanocapsules is also studied. (C) 2003 Elsevier Science Ltd. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/36071]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | Z. H. Wang,C. J. Choi,B. K. Kim,et al. Characterization and magnetic properties of carbon-coated cobalt nanocapsules synthesized by the chemical vapor-condensation process[J]. Carbon,2003,41(9):1751-1758. |
| APA | Z. H. Wang,C. J. Choi,B. K. Kim,J. C. Kim,&Z. D. Zhang.(2003).Characterization and magnetic properties of carbon-coated cobalt nanocapsules synthesized by the chemical vapor-condensation process.Carbon,41(9),1751-1758. |
| MLA | Z. H. Wang,et al."Characterization and magnetic properties of carbon-coated cobalt nanocapsules synthesized by the chemical vapor-condensation process".Carbon 41.9(2003):1751-1758. |
入库方式： OAI收割
来源：金属研究所
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