Low content (0.5 wt. %) of dihydrate tin chloride (Sn2+) salt leads to inclusion of 98 % electroactive phase in poly(vinylidene fluoride) (PVDF), out of this a high yield of piezoelectric β-phase (∼ 49%) is found, which is most desirable for mechanical energy harvesting application. It is also found that Sn2+ salt can significantly enhanced the dielectric property of resulting Sn2+ incorporated PVDF composite film. Thus, the enhancement of β-phase in the PVDF/Sn2+ composite film owns to be a potential material for mechanical energy harvesting application. We have also demonstrated the mechanical energy harvesting capability of the nanogenerator (NG) made with PVDF/Sn2+ composite film under repeated human finger touch.

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