Title page for etd-0831111-160013


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URN etd-0831111-160013
Author Hao-Wei Lai
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2010
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Research and Analysis on Piezoelectric Properties of Near-field Electrospinning PVDF Nanofiber
Date of Defense 2011-06-29
Page Count 84
Keyword
  • Near-field electrospinning
  • PVDF
  • Micro-transducer
  • Energy Harvest
  • MWCNT
  • Piezoelectric fiber
  • Abstract In this study, with near-field electrospinning technique of PVDF (Polyvinylidene fluoride) piezoelectric nano-fibers and the additional multiwalled-carbon nanotubes(MWCNT), both mechanical strength and piezoelectric characteristics of a single nano-fiber were discussed. Then the behavior of piezoelectric fiber actuators was realized using inverse piezoelectric effect. Near-field electrostatic technology can be used to fabricate PVDF piezoelectric fibers with an excellent piezoelectric property compared with film structures due to a higher piezoelectric coefficient and energy conversion efficiency. It is more suitable to produce micro transducers. By adjusting velocity of a fully parametric x-y stage, DC voltage, and the distance between the needle and collection plate, the morphology and polarization intensity of piezoelectric fiber can fully be controlled. In addition, the optimal parameters of PVDF solution such as PVDF powder weight percentage and MWCNT were also discussed. From the observation of XRD (X-ray diffraction), it reveals a high diffraction peak at 2θ=20.8° of piezoelectric crystal β-phase structure. Finally, the actuation property was tested using DC voltage supply, and fiber has significant deflection in the experiment. The vertical deflection can be observed and compared with model solution of piezoelectric cantilever structure. In the fiber’s direct piezoelectric effect, the result shows that fiber can produce an open circuit voltage of 15mV under a low frequency vibration of 7Hz.
    Advisory Committee
  • Chi-Hui Chien - chair
  • Ying-Chung Chen - co-chair
  • Shyh-Chour Huang - co-chair
  • Ceng-Teng Pan - advisor
  • Files
  • etd-0831111-160013.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2011-08-31

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