Fig. 2. FE-SEM and STEM images of several multi-walled carbon nanotubes (MWCNTs). Diameters of Baytube (Bayer MaterialScience), MWNT7 (Hodogaya Chemical Co., Ltd.), VGNF, and VGCF (SHOWA DENKO K.K.) are 15 nm, 60 nm, 80 nm, and 150 nm, respectively.
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