Abstract
The piezoelectric vibration energy harvesters were fabricated by using uniaxially stretched poly (vinylidene difluoride/trifluoroethylene) copolymer (P(VDF/TrFE)) film, and the relationship between piezoelectric power generation and molecular orientation was investigated. The molecular orientation in the stretched P(VDF/TrFE) films was evaluated with polarized Fourier transfer infrared (FT-IR) spectra measurement. In stretched films, the main-chains of P(VDF/TrFE) were aligned along the stretching direction. The piezoelectric properties and the electric power generation of stretched P(VDF/TrFE) films were strongly depended on their molecular orientation, measuring by cantilever-type energy harvesters. The piezoelectric coefficient(e) and output power observed in the energy harvester with the film stretched in the longitudinal direction of cantilever were 16.9 mC/m2 and 222 nW, respectively. These values were approximately 2.1 and 3.5 times these of the unstretched elements.
Highlights
Vibration energy harvesting using piezoelectric material have attracted much attention in the recent years [1,2,3,4]
Inorganic piezoelectric materials with high piezoelectric coefficient have been widely used for vibration power generation, the resonant frequencies of these harvesters are higher than that of environmental vibration
The cantilever structure consisted of Al/P(VDF/TrFE)/Al was used as a design for power generation and piezoelectric measurements.This structure is illustrated in Fig.1 (b)
Summary
Vibration energy harvesting using piezoelectric material have attracted much attention in the recent years [1,2,3,4]. P(VDF/TrFE) (a) and schematic structure of cantilever-type energy harvester (b). Structure generated electric power with a resonant frequency of approximately 25 Hz that is comparable to the environmental vibration.
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