Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
Nanoscale. 2012 Mar 7;4(5):1717-21. doi: 10.1039/c2nr11783e. Epub 2012 Feb 3.
We report a facile and scalable approach to synthesize single-walled carbon nanotubes (SWNTs) with selected diameter distribution by applying a magnetic field perpendicular to the electric field in the arc plasma region. It is found that this magnetic field-induced diameter-selectivity strategy enables the control of the SWNTs with different diameter distributions in different regions, and the diameter-selective efficiency could be enhanced by modifying the direction of magnetic field. Our results indicate that the motions of the catalysts with different particle sizes, positive carbon ions and electrons are significantly influenced by the magnetic field and electromagnetic force, resulting in the different nucleation and growth processes of SWNTs due to the collective interactions between the magnetic field and arc plasma. This approach would enable a viable route towards the synthesis of SWNTs with desired diameter through the tuning of arc parameters in the arc discharge process.
我们报告了一种通过在电弧等离子体区域施加垂直于电场的磁场来合成具有选定直径分布的单壁碳纳米管 (SWNTs) 的简便和可扩展的方法。研究发现，这种磁场诱导的直径选择性策略能够控制不同区域中具有不同直径分布的 SWNTs，并且通过改变磁场的方向可以增强直径选择性效率。我们的结果表明，不同粒径的催化剂、正碳离子和电子的运动受到磁场和电磁力的显著影响，导致 SWNTs 的成核和生长过程因磁场和电弧等离子体之间的集体相互作用而不同。通过在电弧放电过程中调整电弧参数，这种方法将为合成具有所需直径的 SWNTs 提供可行的途径。
