此論文主要在研究利用遠場電紡絲製備不同含量鈦酸鋇奈米纖維(BT) 的BT/PVDF 或BT/P(VDF-TrFE)纖維膜對壓電性能的影響。首先配製BT/PVP的電紡絲溶膠，電紡後將BT/PVP纖維在800oC下煅燒並持溫2小時，以移除PVP而製備出直徑100 nm並具有壓電性的Tetragonal相鈦酸鋇纖維。我們先使用雙氧水將此鈦酸鋇奈米纖維氧化，再以多巴胺進行表面改質。另外也嘗試不經過表面改質，確認是否僅靠黏度即可使其懸浮於PVDF溶膠中，結果發現改質的鈦酸鋇纖維添加量達63 wt%後仍可維持2小時以上的懸浮不沉澱，而不改質的仍能添加至57 wt%，並都電紡成複合壓電纖維膜。將紡出的纖維膜貼上電線和電極後，利用PDMS封裝固化成具有彈性的片材。測量時以自製驅動裝置拍打PDMS使其上下曲折形變產生電位。根據測量的結果，PVDF不論有混鈦酸鋇奈米纖維與否，輸出電性皆和P(VDF-TrFE)差不多。而在添加了63 wt%的鈦酸鋇奈米纖維後，電性都提升了6倍之多。另外，根據王中林教授曾經提出的11項方法來確認奈米發電機能發電是因為壓電性質而非摩擦生電，我們選擇了其中4項進行驗證，並確定電性來源是壓電效果，這顯示出我們所用的遠場電紡絲製備方法，雖然產生的是無方向性的纖維膜，卻仍具有可產生交流電的壓電性質。;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.
