Elucidation of the origin of grown-in defects in carbon nanotubes
Elucidation of the origin of grown-in defects in carbon nanotubes
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DOI：
10.1016/j.carbon.2014.01.006
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发表时间：
2014-04
期刊：
影响因子：
10.9
通讯作者：
H. Yoshida;S. Takeda
中科院分区：
文献类型：
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作者：
H. Yoshida;S. Takeda
通过对碳纳米管化学气相沉积生长过程的原位原子尺度环境透射电子显微镜(ETEM)观察，阐明了碳纳米管自生缺陷的来源。我们的高分辨率电子显微镜观察清楚地表明，纳米催化剂在碳纳米管生长过程中的变形触发了碳纳米管中各种缺陷的形成。碳纳米管与碳纳米管界面的微小变形导致了碳纳米管弯曲的形成和层间距的无序。碳纳米管中石墨层的直径和数量的变化是由于碳纳米管的大的突起和收缩变形造成的。本研究为控制碳纳米管的先天缺陷提供了有见地的策略。
The origin of grown-in defects in carbon nanotubes (CNTs) is elucidated by in situ atomic-scale environmental transmission electron microscope (ETEM) observations of the chemical vapor deposition growth of CNTs. Our high-resolution ETEM observations clearly demonstrate that the deformation of nanoparticle catalysts (NPCs) during the growth of CNTs triggers the formation of various defects in CNTs. The small deformation of NPCs at the interface with CNTs gives rise to the formation of bends and disorder of the interlayer spacing in CNTs. The changes in the diameter and number of graphitic layers in CNTs are caused by the large protrusion on and shrink deformations of NPCs. This study provides insightful strategies to control the grown-in defects of CNTs.