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The core-shell nanofibers of poly(vinylidene fluoride)/polyvinylpyrrolidone has been single-step electrospun from the homogeneous solution of poly(vinylidene fluoride) (PVDF) and polyvinylpyrrolidone (PVP).The preparation process of core-shell nanofibers is quite simple and efficient without any complex electrospinning setup or post-treatment [1].