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(a) X-ray diffraction (XRD) patterns of spin-coated P(VDF-TrFE) film and electrospun P(VDF-TrFE) nanofibers. (b) XRD patterns of the P(VDF-TrFE) nanofibers before and after annealing at 130 °C and 140 °C for 2 h. (c) FTIR spectra of the P(VDF-TrFE) nanofibers before and after annealing at 140 °C for 2 h.
