期刊
CARBON
卷 47, 期 3, 页码 758-763出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2008.11.007
关键词
-
资金
- Ministerio de Educacion y Ciencia (MEC) [MAT2006-26540-E]
- Spanish CICYT [MAT2007-66302-C02]
- Catalan SGR [2005-SGR-00401]
- Generalitat de Catalunya
- ICREA Funding Source: Custom
The purity of the multi-wall carbon nanotubes (MWCNTs) from catalyst nanoparticles (cobalt and iron) after conventional nitric acid refluxing has been assessed by standard methods and magnetic measurements. X-ray diffraction and energy dispersive X-ray spectroscopy analyses are not suitable since the catalyst amounts quickly become beyond the detection limit of such techniques. inductively coupled plasma spectroscopy is useful for this purpose, however it requires a large amount of sample and a long sample processing time since the MWCNTs must be completely destroyed. By contrast, magnetic measurements are a fast and nondestructive method to monitor the catalyst content, showing the existence of a small but detectable signal even for the purest sample, still far from its detection limit. Hence, magnetic measurements are extremely sensitive to detect catalyst impurities and can be used as a quick, first order, tool to evaluate the level of magnetic impurities. (C) 2008 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据