用浮动催化裂解法制取单壁碳纳米管

为寻找一种可以批量制备高质量、高产率单壁碳纳米管的方法 ,对浮动催化裂解碳氢化合物法制取单壁碳纳米管进行了研究。实验采用苯为碳源 ,二茂铁为催化剂 ,氢气为载气 ,噻吩为添加剂。采用扫描电镜、透射电镜、高分辨透射电镜以及拉曼谱等方法对产物进行检测与评估 ,分析了参数对产物的影响。结果表明 ,裂解温度越高 ,越有利于单壁碳纳米管的生长 ;发现通过碳源和直接通入反应室的 H2 流量比为 1:2时 ,较利于单壁碳纳米管的生长。浮动催化裂解法制备出来的单壁碳纳米管直径约为 1nm,直径分布较均匀 ,并且可以半连续、低成本地生产

Synthesis of single-walled carbon nanotubes by floating catalyst method

The synthesis of single walled carbon nanotubes (SWNTs) by the floating catalyst method (FCM) was investigated to find a method for large scale production of high quality SWNTs. The morphology and microstructure of the products were studied using field emission scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution TEM (HRTEM). Raman spectrum was also used to analyze the samples. About 0.3 g raw material was obtained in each reaction and SWNTs with diameters of about 1 nm were observed in the samples. The SWNTs were well graphited and covered with amorphous carbon. The parameters affecting the experimental results, such as the thermal decomposition temperature, the hydrogen flow rate, and the thiophene additive, were discussed and optimized.