Multi-layered BTO/PVDF nanogenerator with highly enhanced performance induced by interlaminar electric field

Abstract

The flexible piezoelectric nanogenerator (PNG) has been spotlighted as a promising candidate for sustainable power source in wireless portable device. Here, a multi-layered BaTiO3 (BTO) /poly(vinylidene fluoride) (PVDF) PNG has been designed by spin coating and layer by layer assembled method. Benefited from the composite strategy and interlaminar electric field effect, the typical four-layered BTO/PVDF nanogenerator contained with 20 wt% BTO nanoparticles represents excellent output performance with voltage of 14.22 V (about 6.49 times than that of 1 layered PNG), current of 2.42 μA, and maximum power of 11.55 μW. The dielectric constant and residual polarization of the PNG vary with the number of piezoelectric layers, which is suspected as the root cause for the enhancement of piezoelectric and output performance. In addition, 4000 pressing-releasing cycles test, finger tapping and foot striking measurements also demonstrated excellent stability of the synthesized BTO/PVDF PNG, showing their great potential in wireless sensing and wearable device applications.