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

Dong Geun Jeong, Huidrom Hemojit Singh, Mi Suk Kim and Jong Hoon Jung ()
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Dong Geun Jeong: Department of Physics, Inha University, Incheon 22212, Republic of Korea
Huidrom Hemojit Singh: Department of Physics, Inha University, Incheon 22212, Republic of Korea
Mi Suk Kim: Department of Physics, Inha University, Incheon 22212, Republic of Korea
Jong Hoon Jung: Department of Physics, Inha University, Incheon 22212, Republic of Korea

Energies, 2023, vol. 16, issue 4, 1-13

Abstract: While poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) film is an excellent piezoelectric material for mechanical energy harvesting, the piezoelectric output varies considerably with the spin coating conditions. Herein, we reported a systematic evaluation of the structural, electrical, mechanical, and microstructural properties of spin-coated P(VDF-TrFE) films obtained at various distances from the center, as well as under different rotational speeds. With increasing distance, the remnant polarization, dielectric constant, and crystallinity of the films increased, which resulted in enhanced piezoelectric power at the largest distance. With increasing rotational speed, the remnant polarization, dielectric constant, and crystallinity of the films initially increased and then decreased, while the Young’s modulus continuously increased. This resulted in an enhanced piezoelectric power at a given rotational speed. The piezoelectric power is proportional to the remnant polarization and inversely proportional to the Young’s modulus. The highest (2.1 mW) and lowest (0.5 mW) instantaneous powers were obtained at the largest (1.09 μC/cm 2 ·GPa −1 ) and smallest (0.60 μC/cm 2 ·GPa −1 ) value of remnant polarization over Young’s modulus, respectively. We explain these behaviors in terms of the centrifugal force-induced shear stress and grain alignment, as well as the thickness-dependent β-phase crystallization and confinement. This work implies that the spin coating conditions of distance and rotational speed should be optimized for the enhanced power output of spin-coated P(VDF-TrFE)-based piezoelectric nanogenerators.

Keywords: spin-coated P(VDF-TrFE); shear stress; grain alignment; crystallization; confinement; power output; piezoelectric nanogenerator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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