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PZT nanofibers with diameter of 150~200nm are prepared via electrospinning and used as dielectric fillers after surface modification in PVDF-based and P(VDF-TrFE)-based nanocomposites.Highly flexible polymer nanocomposite films were fabricated via a simple solutioncast method.The dielectric constant of PVDF-based composites can reach 31 with the volume fraction of 18.7%,and the breakdown strength is 220kV/mm in 2.4vol.%.