Title page for etd-0821112-160733


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URN etd-0821112-160733
Author Cheng-chi Li
Author's Email Address No Public.
Statistics This thesis had been viewed 5339 times. Download 368 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2011
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Design and fabrication of new 3D energy harvester with nano-ZnO rods
Date of Defense 2012-07-21
Page Count 108
Keyword
  • ZnO nanorods
  • Nanogenerators
  • Electrospray
  • Sol-gel
  • Aqueous solution method
  • Schottky contact
  • Abstract This study presents a new way for new 3D energy harvesting energy with vertically aligned nanorods arrays. ZnO nanoparticles array on Au/Cr/Si substrate are directly patterned by electrospray. First, gel solutions with zinc acetate, monoethanolamine and 2-methoxyethanol as the precursor by sol-gel technology were formulated. Then, the solutions were stirred to become clear and homogeneous liquid. Second, the precursor solutions were prepared by electrospray, where a Taylor cone was formed to produce ZnO nanoparticles. Then the ZnO nanoparticles were annealed as seed layers for nanorods. By varying the property of the ZnO solution, needle with collector distance, applied voltage, annealing temperature and molar ratio were discussed. After annealing, the orientation of the ZnO nanorods depend on the crystalline orientation of ZnO nanoparticles. The ZnO nanorods were obtained at a temperature of 90 °C by aqueous solution method. The experimental parameters of lengths, diameters, and pH level of the reaction medium of the Zno nanorod were observed and controlled. The physical structures of ZnO were characterized by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FESEM) analyses. The results show that the ZnO nanoparticles become more intensity with increasing in annealing temperature. The SEM analysis reveals that the ZnO nanorods have diameters about 100-400 nm and length about 200-1200 nm. Finally, Pt electrode atop as Schottky contacts were packed to fabricate nanogenerator with ZnO nanorods. Then the nanogenerator was driven by ultrasonic wave vibration. The wave drives the electrode up and down to vibrate the nanorods, and its voltage and current were also characterized. The measurement results show the maximum power is 0.004х10-8 W during the operation frequency of 42 kHz.
    Advisory Committee
  • J. C. Huang - chair
  • M. L. Wu - co-chair
  • S. C. Huang - co-chair
  • C. T. Pan - advisor
  • Files
  • etd-0821112-160733.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2012-08-21

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