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179. 


In situ observations of self-repairing single-walled carbon nanotubes



F. Börrnert, S. Gorantla, A. Bachmatiuk, J. H. Warner, I. Ibrahim, J. Thomas, T. Gemming, J. Eckert, G. Cuniberti, B. Büchner, and M. H. Rümmeli

Physical Review B (Rapid Comm.) 81, 201401(R) (2010)

Single-walled carbon nanotubes are shown to have self-repairing capabilities exceeding that predicted by theory. Time-series aberration-corrected low-voltage transmission electron microscopy is used to study the defect dynamics of single-walled carbon nanotubes in situ. We confirm experimentally previous theoretical predictions for the agglomeration of adatoms forming protrusions and subsequent ejection. An explanation for the preferred destruction of smaller-diameter tubes is proposed. The complete healing of a ˜20-atom multivacancy in a nanotube wall is shown while theory only predicts the healing of much smaller holes.



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