Temperature and catalyst effects on the production of amorphous carbon nanotubes by a modified arc discharge

被引:64
作者
Zhao, TK [1 ]
Liu, YN [1 ]
Zhu, JW [1 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China
关键词
carbon nanotubes; arc discharge; X-ray diffraction;
D O I
10.1016/j.carbon.2005.06.005
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Large amounts of amorphous, carbon nanotubes (ACNTs) were prepared with Co-Ni alloy powders as catalyst in hydrogen gas atmosphere by a modified arc discharging furnace which can control temperature during the electric arcing process. The experimental results indicate that the cooperative function of temperature and catalyst plays an important role in the soot production rate and the relative ACNT purity. When temperature increases from 25 degrees C to 700 degrees C, the soot production rate increases from around 1 g/h to 8 g/h, the best relative ACNT purity at 600 degrees C can reach up to 99% compared to the room temperature sample. Without catalyst, only plate graphite is formed at 25 degrees C and very few carbon nanotubes are found when temperature increases to 600 degrees C. TEM, SEM, HRTEM and XRD analysis showed that the as-prepared carbon nanotubes are almost amorphous. The soot production rate is 8 g/h and diameter range of amorphous carbon nanotubes is about 7-20 nm, respectively. (C) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2907 / 2912
页数:6
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