论文部分内容阅读
在控制合成碳纳米管的过程中,其中一个非常关键的问题是:能否找到一种简单的途径合成可以控制粒径大小的纳米催化剂。一种通过有机方法合成纳米铁粒子催化剂的实验已经试验成功。在该试验中,用氧化镁作为基体,直径介于9.5~31nm之间的纳米铁微粒作为催化剂,乙醇和环己烷作为两种不同的碳源分别采用化学气相沉积对合成大规模碳纳米管进行了研究。在实验过程中,乙醇和环己烷两种不同碳源的裂解温度均控制在650~850℃之间。同时在该试验中没有使用其他的气体,在这样的条件下成功合成了管径非常小(19.5nm±2.5nm)的多壁碳纳米管。实验还通过X射线衍射对多壁碳纳米管的组成进行了分析,同时通过共振拉曼光谱和高分辨透射电子显微镜对样品进行了表征。
One of the key issues in controlling the synthesis of carbon nanotubes is whether we can find a simple way to synthesize nanocatalysts that can control particle size. An experiment of synthesizing nano-iron particle catalysts by organic methods has been successfully tested. In this experiment, nano-Fe particles with MgO as matrix and diameter between 9.5 ~ 31nm were used as catalyst. Ethanol and cyclohexane were used as two different carbon sources respectively for chemical synthesis of large-scale carbon nanotubes Were studied. During the experiment, the pyrolysis temperatures of two different carbon sources, ethanol and cyclohexane, were both controlled at 650 ~ 850 ℃. At the same time, no other gas was used in this experiment. Under these conditions, a very small diameter (19.5nm ± 2.5nm) multi-walled carbon nanotube was successfully synthesized. The composition of multi-walled carbon nanotubes was also analyzed by X-ray diffraction. Meanwhile, the samples were characterized by resonance Raman spectroscopy and high resolution transmission electron microscopy.