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The piezoelectricity and the voltage outputs increased as BaTiO 3 nanoparticles increased from 0 to 20% by weight. The produced PENG generated an average current density of 0.33 µA cm −2 and an output voltage of 13.2 V. (in Fig. 15 ) Fig. 15. Piezoelectric nanogenerator based on P (VDF-TrFE)/BaTiO 3 nanocomposite.
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