| Summary: | 碩士 === 國立中央大學 === 化學工程與材料工程學系 === 107 === This research was focused on the affects of electrical output by adding various contents of barium titanate (BT) nanofibers of BT/PVDF or BT/P(VDF-TrFE) mats which were synthesized by far-field electrospinning. First, BT/PVP sol for electrospinning was synthesized. After electrospinning, the BT/PVP nanofiers was annealed at 800oC for two hours to remove PVP and produced BT nanofibers with tetragonal phase which is characteristic with piezoelectricity. The BT nanofibers were oxidized by hydrogen peroxide then surface modified with dopamine. Also, we have tried to suspend BT nanofibers by only viscosity in PVDF sol. Consequently, Modified BT fibers can be added up to 63 wt% and suspend at least for 2 hours without precipitation. The pure BT nanofibers can also be added up to 57 wt%. The composite piezoelectric mats were synthesized by electrospinning. Subsequently, the mat was attached two electrodes and electric wires then sealed by PDMS encapsulant which was cured by heating and become a flexible sheet. The PDMS encapsulant was applied a up and down strain by a self-made device and generate electric potential. According to our measurements, no matter the BT nanofibers were added or not, the electrical output of PVDF and P(VDF-TrFE) were almost the same. On the other hand, when the BT nanofibers were added up to 63 wt%, the electric outputs were enhanced by 6 times. On the basis of the 11 methods which can confirm the electric output of a nanogenerator is generated by piezoelectric instead of triboelectric were presented by Prof. Z. L. Wang. Therefore, we have selected and carried out 4 of them, and it can be proved that the electric output is generated by piezoelectric. It is revealed that we utilized the far-field electrospinning method can produce random aligned mats which still can generate alternative current by piezoelectric.
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