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(a), Low-magnification TEM image of several thickened MWCNTs. The inset shows a high-resolution TEM image of a pristine MWCNT prior to graphene growth. (b), A section of a thickened tube. (c), The tip region of a thickened nanotube with a closed cap. (d), Top view of a thickened nanotube. The growth times for these thickened nanotubes are 60 min (a), 15 min (b), 30 min (c), and 20 min (d).
