利用化学气相沉积制备碳纳米管的过程中 ,在含氮的气体环境中 ,竹节型结构的碳纳米管在催化剂的作用下可制备出来。然而 ,目前对其形成机制仍不十分清楚。本工作中 ,分析化学气相沉积制备碳纳米管过程中催化剂的状态之后 ,研究了碳在不同状态催化剂中的扩散 ,提出了新的竹节型结构碳纳米管形成机制。 In the process of preparing carbon nanotubes by chemical vapor deposition, carbon nanotubes of bamboo-type structure can be prepared under the action of a catalyst in a nitrogen-containing gas environment. However, the mechanism of its formation is still not very clear. In this work, after analyzing the state of the catalyst during the preparation of carbon nanotubes by chemical vapor deposition, the diffusion of carbon in different state catalysts was studied, and a new mechanism for the formation of bamboo-type carbon nanotubes was proposed.