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科学通报  2012 

原位观察电子束辐照下双壁碳纳米管的不稳定性

DOI: 10.1360/972011-2381, PP. 1692-1696

Keywords: 双壁碳纳米管,电子束辐照非热激活,结构不稳定性,表面纳米曲率效应,融蒸和扩散

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Abstract:

室温下利用高分辨透射电子显微镜原位观察了两端固定和一端固定、另一端自由的双壁碳纳米管在电子束辐照下的结构不稳定性.实验发现,在相同辐照条件下,两端固定的双壁碳纳米管首先径向持续均匀收缩,然后局部颈缩,最后在颈缩处断裂;一端固定、另一端自由的双壁碳纳米管轴向长度持续快速缩小,而径向收缩相对缓慢.我们利用最近提出的表面纳米曲率效应和能量束诱导非热激活效应基础上新发展的碳原子“融蒸”和“扩散”机制,对上述电子束辐照下双壁碳纳米管结构不稳定现象进行了全新、合理的解释.

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