Figure 2.

Pairs of carbon interstitials in a (9,0)@(18,0) double-wall carbon nanotube. (a) Inter-tube bridge (arrows point to C interstitials), (b) hillock on the inner (9,0) tube (the atoms and bonds of the outer shell are shown in a wire frame).

Tsetseris and Pantelides Nanoscale Research Letters 2011 6:245   doi:10.1186/1556-276X-6-245
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