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Field emission scanning electron microscope images. (a) 3 wt.% MNTs-PVDF, (b) 4 wt.% MNTs-PVDF, (c) 5 wt.% MNTs-PVDF, (d) 1 wt.% f-MWCNTs-5 wt.% MNTs-PVDF, and (e) 2 wt.% f-MWCNTs-5 wt.% MNTs-PVDF, and (f) high-resolution image of 1 wt.% f-MWCNTs-5 wt.% MNTs-PVDF.
