Effects of acid treatment duration and sulfuric acid molarity on purification of multi-walled carbon nanotubes

被引：11
作者：
Mortazavi, Seyedeh Z. [1 ]
Novinrooz, Abdul J. [1 ]
Reyhani, Ali [1 ]
Mirershadi, Soghra [1 ]
机构：
[1] Mat Res Sch NSTI, Karaj, Iran
来源：
CENTRAL EUROPEAN JOURNAL OF PHYSICS | 2010年 / 8卷 / 06期
关键词：
multi-walled carbon nanotubes; thermal chemical vapor deposition; purification; sulfuric acid; CHEMICAL-VAPOR-DEPOSITION; HYDROGEN STORAGE; GROWTH; CATALYST; FE; NI; CVD; MGO;
D O I：
10.2478/s11534-010-0017-9
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Multi-walled carbon nanotubes were synthesized using a Fe-Ni bimetallic catalyst supported by MgO using thermal chemical vapor deposition. Purification processes to remove unwanted carbon structures and other metallic impurities were carried out by boiling in sulfuric acid solution. Various analytical techniques such as TGA/DSC, Raman spectroscopy, SEM, HRTEM and EDAX were employed to investigate the morphology, graphitization and quality of the carbon nanotubes. The obtained results reveal the molarity of sulfuric acid and immersed time of the carbon nanotubes in the acid solution is very effective at purifying multi-walled carbon nanotubes. It was also found that 5 M concentration of boiling sulfuric acid for a 3 h treatment duration led to the highest removal of the impurities with the least destructive effect. Moreover, it was observed that acid treatment results in decreasing of CNTs' diameter.
引用
收藏
页码：940 / 946
页数：7
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