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The defense date of the thesis is 2007-08-29
The current date is 2019-07-18
URN etd-0829107-173306 Statistics This thesis had been viewed 1724 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 Date of Defense 2007-07-31 Date of Submission 2007-08-29