Abstract Free-standing flexible Fe-doped ZnO (Z (1-x) F(x) O)/PVDF-TrFE nanocomposite films were prepared via solvent casting method with a constant filler/polymer ratio. The influence of Fe concentration (x = 0.01, 0.03 and 0.05) made no significant change in the crystalline β-phase of the composite films as confirmed from XRD, FTIR and DSC studies. Maximum enhancement in the dielectric and ferroelectric behaviour was observed for the composite films with x = 0.05 showing a dielectric permittivity of 21.03 at 1 kHz and a remnant polarization of 0.125 μC/cm2. These enhanced properties were attributed to the reduced crystal size of the nanoparticles, which affects the interface space polarization and the effective volume of composite films. Finally, the demonstration of enhanced piezoelectric properties of the composite film (x = 0.05) with ~7 V output voltage under continuous finger tapping and driving LEDs makes it a potential device for energy harvesting applications.

中文翻译：

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Fe掺杂ZnO/PVDF-TrFE复合薄膜的介电和压电性能增强

摘要 通过溶剂浇铸法以恒定的填料/聚合物比制备了独立的柔性 Fe 掺杂 ZnO (Z (1-x) F(x) O)/PVDF-TrFE 纳米复合薄膜。XRD、FTIR 和 DSC 研究证实，Fe 浓度（x = 0.01、0.03 和 0.05）的影响没有使复合膜的结晶 β 相发生显着变化。对于 x = 0.05 的复合膜，观察到介电和铁电行为的最大增强，显示在 1 kHz 下的介电常数为 21.03，剩余极化为 0.125 μC/cm2。这些增强的特性归因于纳米粒子晶体尺寸的减小，这会影响界面空间极化和复合膜的有效体积。最后，证明复合膜的压电性能增强（x = 0.