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Title page for etd-0829107-173306


URN etd-0829107-173306 Statistics This thesis had been viewed 1675 times. Download 5 times.
Author Po-Kai Chuang
Author's Email Address No Public.
Department Materials Engineering
Year 2006 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 82
Title Synthesis of Carbon Nanofibers on Carbon Fiber Fabrics Using Electrodeposited Catalysts
Keyword
  • electrodeposition
  • chemical vapor deposition
  • carbon nanofibers
  • PAN-based carbon fiber
  • PAN-based carbon fiber
  • carbon nanofibers
  • chemical vapor deposition
  • electrodeposition
  • Abstract Carbon nanofibers(CNFs) and carbon nanotubes(CNTs) are widely investigated because of their excellent physical and chemical properties. Previous reports mentioned that CNFs and CNTs grown on the conventional carbon fiber cloth were proposed for several applications. In this research, CNFs were grown by chemical vapor deposition using electrodepositied Ni catalysts on the PAN-based carbon fiber cloth. In the catalytic growth of CNFs and CNTs, to produce well distributed nano-sized catalysts is a critical processing, thus a surface modification pretreatment to carbon fiber cloth was used to improve the distribution of catalysts on the surface of fiber cloth.
      Three different electrode assembly methods were employed in the electro-deposition process and the effect of surface modification pretreatment was also investigated. The electrodeposition results indicated that the catalyst particles deposited using a ring-like electrode method showed a better distribuition than that of the other two methods. The electrodeposited Ni catalysts showed a much better distribution on carbon fiber cloth after a surface modification pretreatment, and reproducible results could be achieved. The pacticles size decreased when a lower concentration of surface modification solution was used.
      CNFs showed a entangled morphology when using the electrodeposited Ni catalyst with or without a surface modification pretreatment. CNFs with a larger aspect ratio were found when the Ni catalyst were electrodepositied with a surface modification pretreatment. CNFs with uniform diameter distribution can be grown at a low temperature of 540℃.As the growth temperature was raised, CNFs with a wider diameter distribution were obtained. The carbon yield increased with an increase of deposition time and acetylene concentration. The TEM results indicated that the graphene layers of CNFs are not well ordered.
    Advisor Committee
  • Shinn-Shyong Tzeng - advisor
  • Che-hung-Wei - co-chair
  • San-De Chyiu - co-chair
  • Files indicate not accessible
    Date of Defense 2007-07-31 Date of Submission 2007-08-29


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