Vibration Energy Harvesting Characterization of 1 cm$^{2}$ Poly(vinylidene fluoride) Generators in Vacuum

2011 ◽  
Vol 50 (9) ◽  
pp. 09ND15 ◽  
Author(s):  
Ziping Cao ◽  
Jinya Zhang ◽  
Hiroki Kuwano
Keyword(s):  
Energy Harvesting ◽  
Vinylidene Fluoride ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Poly Vinylidene Fluoride

Characterization of Direct Piezoelectric Properties for Vibration Energy Harvesting

2011 ◽  
Vol 18 (9) ◽  
pp. 092026 ◽  
Author(s):  
Takeshi Yoshimura ◽  
Hiroki Miyabuchi ◽  
Syuichi Murakami ◽  
Atsushi Ashida ◽  
Norifumi Fujimura
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Properties ◽  
Vibration Energy ◽  
Vibration Energy Harvesting

scholarly journals Ice-templated poly(vinylidene fluoride) ferroelectrets

2019 ◽  
Author(s):  
Chris Bowen
Keyword(s):  
Energy Harvesting ◽  
Vinylidene Fluoride ◽  
Cost Effective ◽  
Vibration Energy Harvesting ◽  
Poly Vinylidene Fluoride ◽  
Corona Poling ◽  
Range Alignment ◽  
Directional Freezing ◽  
Mechanical Stretching ◽  
Environmentally Friendly Approach

Ferroelectrets are piezoelectrically-active polymer foams that can convert externally applied loads into electric charge for sensor or energy harvesting applications. Existing processing routes used to create pores of the desired geometry and degree of alignment appropriate for ferroelectrets are based on complex mechanical stretching and chemical dissolution steps. In this work, we present the first demonstration of the use of freeze casting as a cost effective and environmentally friendly approach to produce polymeric ferroelectrets. The pore morphology, phase analysis, relative permittivity and direct piezoelectric charge coefficient (d33) of porous poly(vinylidene fluoride) (PVDF) based ferroelectrets with porosity volume fractions ranging from 24% to 78% were analysed. The long-range alignment of pore channels produced during directional freezing is shown to be beneficial in forming a highly polarised structure and high d33 ∼ 264 pC N−1 after breakdown of air within the pore channels during corona poling. This new approach opens a way to create tailored pore structures and voids in ferroelectret materials for transducer applications related to sensors and vibration energy harvesting.

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