多壁碳纳米管在循环相变过程中结构变化初探

Preliminary structural study of multi-wall carbon nanotubesin a returning phase transition process

对由离子束辐照多壁碳纳米管(MWCNTs)产生的无定形碳纳米线(ACNWs)进行了高温退火(2400℃)处理,通过透射电子显微镜(TEM)观察发现,ACNWs体部转变成与原来MWCNTs相似的管状石墨结构,而其封端区域的石墨晶体结构形态却与原来的MWCNTs完全不同,且变化多端.基于实验结果,对其相变过程机理提出了一个概念性的模型.

In this work, amorphous carbon nanowires （ACNWs）, formed during ion irradiating multi-wall carbon nanotubes （MWCNTs）, were annealed at a high temperature of 2400℃. Transmission electron microscopy observations revealed that the body of ACNWs had transformed to a tube-like structure similar to that of the original MWCNTs, but the tip structure had various forms and was quite different from the original MWCNTs. Based on the results, we proposed a conceptual model of phase transition mechanism.