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. 2010 Jul 30;3(8):4142–4174. doi: 10.3390/ma3084142

Figure 2.

Figure 2

(a) Formation of multi-walled nanotubes (MWNT) by rolling up a stack of graphene sheets into concentric cylinders; straight MWNTs (b) θ=0 and (c) θ0 [30].