State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, People's Republic of China.
Nanotechnology. 2012 Feb 17;23(6):065604. doi: 10.1088/0957-4484/23/6/065604. Epub 2012 Jan 17.
We demonstrate a one-step approach for selecting the number of walls formed during carbon nanotube (CNT) growth by catalytic decomposition of CH(4) over Fe-Mo/MgO catalysts. Scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), thermal gravimetric analysis (TGA) and Raman spectroscopy analyses indicate that high purity single-walled, double-walled and triple-walled carbon nanotubes can be synthesized by tuning the Fe:Mo atomic ratio of catalysts. The results reveal that the concentration of Mo in the catalyst plays an important role in the size of catalyst particles and in the deposition rate of carbon atoms during CNT growth. Thus, the wall numbers of CNTs can be controlled precisely.
我们展示了一种通过在 Fe-Mo/MgO 催化剂上催化分解 CH(4)来选择碳纳米管 (CNT) 生长过程中形成的壁数的一步法。扫描电子显微镜 (SEM)、高分辨率透射电子显微镜 (HRTEM)、热重分析 (TGA) 和拉曼光谱分析表明，通过调整催化剂中的 Fe:Mo 原子比，可以合成高纯度的单壁、双壁和三壁碳纳米管。结果表明，催化剂中 Mo 的浓度在催化剂颗粒的大小以及 CNT 生长过程中碳原子的沉积速率方面起着重要作用。因此，可以精确控制 CNT 的壁数。
