1.7 V Nanogenerator realized via direct-write, in situ poled near-field electrospun nanofibers on flexible substrate.

• Main Authors: Shao-Yu Chen, 陳紹瑀
• Other Authors: Yiin-Kuen Fuh
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/58584675089801528071

碩士 === 國立中央大學 === 機械工程研究所 === 100 === This thesis mainly research fabrication of nanogenerator, piezoelectric technology and application in electrospinning. The focus of the study is (1) Fabrication of nanogenerator via near-field electrospinning process, (2) Measurement and application of nanogenerator, (3) High-Throughput production of nanofibrous mats via a porous materials electrospinning Process. (1)A Facile Electrode Pattern for Voltage and Current Superposition of Near-field Electrospun Piezoelectric Nanogenerator–Fabrication and Design Harvesting energy from human motion in a routine exercise is a promising and viable approach for powering a wide range of wireless mobile electronics in our daily life. Direct-write piezoelectric polymeric nanogenerator is robust and high energy conversion efficiency such that tiny physical motions/disturbances over human operation frequencies can be stimulated and energy scavenged. Here, we demonstrate a direct-write polymeric poly (vinylidene fluoride) PVDF nanogenerator on the flexible substrate and a simple scaling-up electrode design for easy superposition of both voltage and current. (2) A Facile Electrode Pattern for Voltage and Current Superposition of Near-field Electrospun Piezoelectric Nanogenerator-Measurement and Application The nanogenerators fabricated using arrays of PVDF nanofibers in parallel and in serial configurations which are capable of producing a peak output voltage of ~1.7 V and the current reached up to 300nA. This achievement is two order of magnitude increases in both voltage and current output compared with conventional near-field setup for only one electrospun nanofiber. In addition, the alternating current output of the nanogenerator is rectified and demonstrates the technological feasibility for energy storage and recharging applications. This work shows a practical and versatile technique of using direct-write electrospun nanogenerators for powering mobile and wireless microelectronic devices. (3)High-Throughput Production of Nanofibrous Mats Via a Porous Materials Electrospinning Process A facile method is presented for the electrospinning of multiple polymer jets into nanofibers. The experiments in this study electrified 7 wt% PEO (polyethylene oxide) and 10 wt% PVDF (polyvinylidene fluoride) solutions and adopted porous materials(bars with various dimensions) to enhance the productivity of the electrospinning process. The proposed electrospinning mechanism can be used to mass produce nanofibers at a relatively lower voltage (D.C. 6~7 kV) and obtain a remarkable increase in throughput. The experimental results showed that the jets per area were on the order of 85~150jets/cm2, which is one to two orders of magnitude higher than the conventional single needle electrospinning process and can easily surpass the magnetic needleless method by a factor of 3.3 to 5.8. The proposed method of using porous materials as electrospinning devices (nozzles) should contribute to the advancement of next-generation, large-scale electrospinning systems for nanofiber fabrication.