The nucleation and growth of carbon nanotubes in a mechano-thermal process
The nucleation and growth of carbon nanotubes in a mechano-thermal process
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DOI：
10.1016/j.carbon.2004.02.003
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发表时间：
2004-01-01
期刊：
影响因子：
10.9
通讯作者：
Chadderton, LT
中科院分区：
文献类型：
--
作者：
Chen, Y;Conway, MJ;Chadderton, LT
在机械热法中，碳纳米管的成核和生长过程是分开的，该方法首先在室温下对石墨粉进行机械球磨，然后在1400℃以下进行热处理。球磨石墨含有形核结构(纳米金属颗粒和含有五边形的变形(002)层)，无序碳作为自由碳原子源。随后的退火激活了两种类型的多壁纳米管在没有碳蒸气的情况下的生长。通过金属催化溶液-沉淀法(固-液-固)制备了直径为20 nm的纳米管。在这两种情况下，碳纳米管都是从尖端封闭的无序碳颗粒中生长出来的。(C)2004爱思唯尔有限公司。保留所有权利。
Separate nucleation and growth processes of carbon nanotubes were found in a mechano-thermal method in which carbon nanotubes are produced by first mechanical milling of graphite powder at room temperature and subsequent thermal annealing up to 1400 degreesC. The ball-milled graphite contains nucleation structures (nanosized metal particles and deformed (002) layers containing pentagons), and disordered carbon as a free carbon atom source. The subsequent annealing activates the growth of two types of multi-walled nanotubes in the absence of carbon vapor. Thin nanotubes (diameter 20 nm) are formed through a metal catalytic solution-precipitation process (solid-liquid-solid). In both cases, carbon nanotubes grew out from disordered carbon particles with closed tips. (C) 2004 Elsevier Ltd. All rights reserved.