Effect of Centrifugal Force on Power Output of a Spin-Coated Poly(Vinylidene Fluoride-Trifluoroethylene)-Based Piezoelectric Nanogenerator

While poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) film is an excellent piezoelectric material for mechanical energy harvesting, the output varies considerably with spin coating conditions. Herein, we reported a systematic evaluation of structural, electrical, mechanical, and microstructural properties spin-coated P(VDF-TrFE) films obtained at various distances from center, as well under different rotational speeds. With increasing distance, remnant polarization, dielectric constant, crystallinity increased, which resulted in enhanced power largest distance. speed, initially increased then decreased, while Young’s modulus continuously increased. This given speed. The proportional to polarization inversely modulus. highest (2.1 mW) lowest (0.5 instantaneous powers were (1.09 μC/cm2·GPa−1) smallest (0.60 value over modulus, respectively. We explain these behaviors terms centrifugal force-induced shear stress grain alignment, thickness-dependent β-phase crystallization confinement. work implies that conditions distance speed should be optimized P(VDF-TrFE)-based nanogenerators.