由二种烟煤制备碳纳米管的探索性研究

CARBON NANOTUBES FROM TWO BITUMINOUS COALS

以一种中国烟煤和一种新西兰烟煤为原料 ,采用电弧等离子体法制备碳纳米管。碳纳米管及其副产物富勒烯烟灰的表征采用扫描电镜 (SEM)和红外光谱 (FT IR)等技术。结果表明 :电弧放电时的缓冲气体压力对碳纳米管的产率影响很大 ;在一定的缓冲气压下电极间电流和电极间距各存在一最佳值。在He气压力为 0 .0 6 6 5MPa、工作电流为 40A条件下进行电弧放电 ,阴极上棒状沉积物的内芯中碳纳米管含量高达 75 %以上。基于实验结果 。

Carbon nanotubes(CNTs) were prepared by arc plasma discharge method from one Chinese coal and one New Zealand coal. It has been verified that the buffer gas pressure is a key factor for forming CNTs, and the optimum current intensity and the distance between the two carbon electrodes vary accordingly with varying the buffer gas pressure. SEM study indicates that carbon nanotubes in the inner part of the rod like cathode deposites are over 75?% when the buffer gas pressure is 0.066?5?MPa and the current is 40?A. The fullerene containing soots deposited on the inner wall surface of the reactor are characterized by mass and FTIR spectroscopy. The influence of arc parameters on the growth of coal derived CNTs under arc discharge plasma conditions is also briefly discussed.