本研究設計ㄧ新穎的多紡口電紡結構，搭配近場靜電紡絲製程技術(Near-field Electrospinning)，達到同時電紡多根PVDF 纖維的目標，再導入玻璃滾筒式收集方式，製作出批量綑狀且高機能的聚偏氟乙烯(Polyvinylidene fluoride, PVDF)壓電纖維。製程中，藉由定量注射幫浦的輔助，使PVDF 溶液裝填於以印刷電路板(Printed circuit board, PCB)與錫球結構製作的多紡口系統結構中，施予1.0*107 至1.6*107V/m的環境電場，使PVDF液滴而形成泰勒錐狀(Taylor cone)，其突破表面張力形成極細的PVDF壓電纖維，並批量收集於滾動中的玻璃滾筒。從玻璃滾筒取下的PVDF 壓電纖維，藉由掃描式電子顯微鏡(Scanning electron microscope, SEM)與微型拉伸強度測試(Microforce tensile testing)量測出本PVDF壓電纖維具有1.5-4.5μm 線徑及1.21GPa 的楊氏模數，且經由X 光繞射分析儀(X-ray diffraction, XRD)驗證，此PVDF 壓電纖維，有較高於PVDF 粉末之β 相壓電結晶結構強度(2θ=20.5 度)。最後，將PVDF壓電纖維兩端固定於可撓性基板的銅電極上，形成壓電特性量測裝置，其發現當結構上的壓電纖維受到2~7 Hz 的振盪頻率時可以得到18 mV 至76 mV 電壓訊號及0.42 nA 至1.1 nA 的電流訊號，由此可證本研究的PVDF 壓電纖維可於低頻環境中獲取微型能量，在未來可經由編織的方式，使此纖維形成ㄧ高機能布料，應用於自發性獵能衣物。
In this study, we improve the near-field electrospining by multi-nozzle spinnerets with a glass cylindrical collector in order to produce multi-fibers at a time and fabricate mass and cluster-shape and functional permanent piezoelectricity of PVDF (Polyvinylidene fluoride) fiber arrays. Throughout the process, the PVDF macromolecular solution was filled in multi-nozzle spinnerets structure composed of the designed Printed circuit board and Solder ball structures. With quantitative injector and high electric field: 1*107-1.6*107V/m, PVDF drops can be observed to form Taylor cones and overcame surface tension of the solution itself, then extra-fine PVDF fibers were obtained on the glass cylindrical collector. From measurement of scanning electron microscope and microforce tensile testing, the result reveals that the diameter of the electrospun nanofibers is 1.5-4.5um and the Young’s modulus is 1.21GPa. From the observation of XRD (X-ray diffraction), it shows a high diffraction peak at 2θ=20.5° of piezoelectric crystal β-phase structure. For the electricity measurement system, PVDF fibers were firmly bonded to the copper foil electrode pair. Under 2-7 Hz vibration, the piezoelectric fibers harvesting device with parallel electrode could generate the voltage of 18-76 mV and the current of 0.42 - 1.1 nA, respectively. These good piezoelectric PVDF fibers with excellent mechanical and electrical energy conversion are able to generate energy from low-frequency vibration of environment, so these high performance fibers can be applied to spontaneous hunting clothes in the future.
