Mahato, P K and Seal, A and Garain, S and Sen, S
(2015)
Effect of fabrication technique on the crystalline phase and electrical properties of PVDF films.
Materials Science-Poland , 33 (1).
pp. 157-162.
ISSN 0137-1339
Abstract
The effect of different fabrication techniques on the formation of electroactive beta-phase polyvinylidene fluoride (PVDF) has been investigated. Films with varying concentration of PVDF and solvent - dimethyl formamide (DMF) were synthesized by tape casting and solvent casting techniques. The piezoelectric beta-phase as well as non polar alpha-phase were observed for both the tape cast and solvent cast films from X-ray diffraction (XRD) micrographs and Fourier transform infra-red spectroscopy (FT-IR) spectra. A maximum percentage (80 %) of beta-phase was obtained from FT-IR analysis for a solvent cast PVDF film. The surface morphology of the PVDF films was analyzed by FESEM imaging. The dielectric properties as a function of temperature and frequency and the ferroelectric hysteresis loop as a function of voltage were measured. An enhancement in the value of the dielectric constant and polarization was obtained in solvent cast films.
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