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Preparation of High β-Phrase Poly(Vinylidene Fluoride) Thin Film by Doping Hydrated Magnesium Nitrate

In this study, the high β-phrase poly(vinylidene fluoride) (PVDF) thin film was spin-coated from a solution that contained microscale hydrated magnesium nitrate. Fourier transform infrared spectroscopy (FT-IR) was used to study influence of the hydrated magnesium nitrate on crystallization behavior of PVDF thin films. As indicated, the presence of hydrated magnesium nitrate promotes the formation of β crystal phase, the desired ferroelectric phrase, in PVDF films. Further, the surface topography, the relative permittivity, as well as its pyroelectric constant and leakage current of PVDF thin films were characterized. At room temperature, in the range of 1Hz∼106Hz, the relative permittivity constant and the dielectric loss of PVDF thin films with different hydrated magnesium nitrate concentrations exhibited similar curve trend, the dielectric properties of PVDF films weren't changed by doping hydrated magnesium nitrate. However, the pyroelectric constant was improved by doping hydrated magnesium nitrate because of the high β phrase. This reveals that the PVDF thin films with high figures of merit (Fv and Fd) could be applied in pyroelectric detector.