Enhancement of the piezoelectric coefficient in PVDF-TrFe/CoFe₂O₄ nanocomposites through DC magnetic poling

In the last years flexible, low-cost, wearable, and innovative piezoelectric nanomaterials have attracted considerable interest regarding development of energy harvesters sensors. Among materials, special attention has been paid to electroactive polymers such as poly(vinylidene fluoride) (PVDF) its copolymer fluoride- co -trifluoroethylene) (PVDF-TrFe), which is one most extensively investigated polymers, due high β phase content resulting from specific curing or processing conditions. However, obtain a coefficient ( d 33 ) alignment domains needed, usually reached through applying electric field at moderate temperatures. This process, referred electrical poling, requires deposition contact electrodes on sample surface use high-voltage apparatus. present work, in order overcome these constraints, we produced, characterized, studied polymer nanocomposite consisting CoFe 2 O 4 nanoparticles dispersed PVDF-TrFe with enhancement an applied DC magnetic field. The poling was demonstrated be particularly effective, leading values up 39 pm/V. type does not need top electrode fields (the maximum value obtained 50 mT, using current 0.4 A) making PVDF-TrFE/CoFe suitable for fabrication highly efficient devices harvesting wearable