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The crystallinities of Ag-doped poly(vinylidene fluoride) (PVDF) films were modified by removing Ag + using a novel washing process, which allowed control of the ratio of γ- and β-phases. The polarity of the composite film without Ag + removal through the washing process reached 98%, and the β-phase content in the total electroactive phase was increased to 61%, according to Fourier-transform infrared spectroscopy. When Ag + were removed through a process involving several cycles of washing, filtering, drying, and re-dissolving, the highest ratio of the γ-phase was increased to 67%, 28% higher than that before washing. This showed that Ag + induced β-phase formation while Ag nanoparticles induced γ-phase formation, and that the ratio of γ- and β-phases in PVDF composite films can be controlled to suit specific applications by this washing process.

Preparation and electroactive phase adjustment of Ag-doped poly(vinylidene fluoride) (PVDF) films