Length-controlled synthesis of single-walled carbon nanotubes by arc discharge with variable cathode diameters

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• 作者：Yanjie Su ; Yaozhong Zhang ; Hao Wei ; Bingjian Qian ; Zhi Yang ; Yafei Zhang ; ^{yfzhang@sjtu.edu.cn}
• 刊名：Physica E
• 出版年：2012
• 期刊代码：139_13869477
• 类别：et
• 出版时间：April-May, 2012
• 卷：44
• 期：7-8
• 页码：1548-1551
• 文件大小：1137 K

摘要

Single-walled carbon nanotubes with controlled length distributions have been successfully achieved by changing the cathode diameter in the arc discharge process. We find that the purities of SWNT products and the crystallinity of SWNTs are improved by using the cathode with certain diameter. By simply increasing the cathode diameter from 0.8 to 2.0 cm, the most abundant length fractions of SWNTs increase from 1.2 to 1.8 渭m. On the other hand, the diameter distributions of SWNTs are also influenced by changing cathode diameter, ascribing to the changes in SWNT nucleation and growth processes caused by different plasma densities and temperature distributions. This approach would enable a viable route towards the synthesis of SWNTs with targeted length through the tuning of cathode diameter.