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SEM images of neat PVDF (a), PVDF/2 wt % Fe2O3 (b), PVDF/2 wt % Ce–Fe2O3 (c), PVDF/2 wt % Co3O4 (d), and PVDF/2 wt % Ce–Co3O4 (e) samples. The inset shows the distribution of fiber diameter for the composite nanofibers containing Ce-doped metal oxides.
