Furthermore, the dissipation factors of the s-Zn/PVDF and Zn@ZnO/PVDF were still at low level owing to the presence of self-passivation layer or ZnO shell between Zn core and PVDF, leading to a high critical filler concentration, whereas, a noticeable variation in the dissipation factor for the f-Zn/PVDF is observed up to 12 vol.% f-Zn.