Abstract
Poly(vinylidene fluoride) (PVDF) is a piezoelectric polymer material. In general, it is necessary to give large stretch to PVDF film when PVDF film is used as sensor or actuator element. However, we recently found that PVDF showed piezoelectricity without large stretch, which nano-clays are uniformly dispersed. The aim of present study is to investigate the possibilities of nano-clay/PVDF composite film as actuator element, and investigate its piezoelectric mechanism. Firstly, nano-clay/PVDF composite film is fabricated by solvent casting. Secondarily, we investigate the change of electrical displacement according to the input voltage of triangle wave by using Sawyer-tower bridge circuit. Then, the change of impedance is also measured at broad frequency by using impedance analyzer. Thirdly, we apply the input voltage of sine wave to fabricated films, and measure the output oscillation generated from films. Fourthly, X-ray analysis is conducted in order to investigate the nano and micro-structure in nano-clay/PVDF composite film. Finally, we discuss the possibilities of nano-clay/PVDF composite film as actuator element and its piezoelectric nature from present results.
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