Preparation of polypyrrole-modified barium titanate nanoparticles/polyvinylidene fluoride composite piezoelectric films and their performance analysis
In order to solve the problems of big dielectric difference between barium titanate(BT)and polyvinylidene fluoride(PVDF)in BT/PVDF composites and the difficulty of polarization of BT,polypyrrole-modified BT nanoparticles(BT@PPy)were prepared via microemulsion polymerization by using pyrrole(Py)as polymeric monomer,and then the BT@PPy nanoparticles as spinning solution components for preparing BT@PPy/PVDF composite piezoelectric films by electrospinning method;then the BT@PPy/PVDF piezoelectric nanogenerator was prepared by attaching copper film electrode to the upper and lower surface of the composite piezoelectric film.The structure and morphology of BT@PPy nanoparticles were characterized by FT-IR,TEM and XRD.The piezoelectric constants of the composite films and the output voltage of the piezoelectric nanogenerator were measured.The results showed that polypyrrole successfully coated BT nanoparticles and formed a core-shell structure;when the mass fraction of BT@PPy nanoparticle filler was 1％,the residual polarization of the composite piezoelectric film increased from 0.125 μC/cm2 before modification to 0.472 μC/cm2,and the piezoelectric constant increased from 12 pC/N to 23.2 pC/N.The output voltage of the nano-generator was increased from 0.2 V to 2.5 V,and the nano-generator had good sensitivity to sense external pressure.The polypyrrole modification of BT nanoparticles could improve the polarization degree of BT in the BT/PVDF composite piezoelectric layer and the piezoelectric constant of the piezoelectric layer,so as to increase the output voltage of the piezoelectric generator.The study results provide useful reference for the preparation of piezoelectric nanogenerators with high piezoelectric output.
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