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URN etd-0731106-105919 Statistics This thesis had been viewed 2726 times. Download 398 times. Author Sheng-Fu Huang Author's Email Address No Public. Department Materials Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 169 Title Synthesis of Carbon Nanofibers using a Co-Al Composite Catalyst by Chemical Vapor Deposition Keyword microstructure carbon nanofibers(CNFs) Co-Al composite catalyst calcination calcination Co-Al composite catalyst carbon nanofibers(CNFs) microstructure Abstract In this study, carbon nanofibers (CNFs) were grown by chemical vapor deposition (CVD) using a Co-Al composite catalyst derived from Feitknecht compound precursor. The experimental results showed that the highest yield of CNFs were obtained when the starting catalysts were calcined at 400℃ for 4 hours. The yield of CNFs were affected by the Co-Al composite catalyst with different calcination conditions, but no obvious change in the microstructure of CNFs were observed when using the catalyst with different calcination conditions.
Different synthetic parameters of CNFs were carried out by CVD over catalyst with calcination at 400℃ for 4 hours in air. Before purging carbon source gas, the synthetic parameters were carried out with reduction and non-reduction process. With reduction process, the CNFs were performed in the range of 500-700℃, and the CNFs with conical interval and tubular microstructure can be synthesized with different temperatures. Without reduction process, the CNFs were carried out in the range of 600-800℃, and the microstructure of CNFs with conical interval and tubular microstructure can be synthesized with different temperatures. For comparison between reduction and non-reduction process, the experimental results showed that the yield of CNFs was affected by reduction or non-reduction process, but no obvious change in the microstructure of CNFs was observed by reduction and non-reduction process.
The tubular microstructure of CNFs was synthesized at 700℃ from pure methane by non-reduction process. When hydrogen was added to methane, the CNFs with bamboo-like microstructure was synthesized at the same temperature. The CNFs with conical interval microstructure was synthesized at 600℃ from pure methane by non-reduction process. When nitrogen was added to methane, the CNFs with conical interval was tend to transform into tubular –like structure of CNF.
Advisor Committee Shinn-Shyong Tzeng - advisor
Chi-Yuan Huang - co-chair
Chuen-Horng Tsai - co-chair
Files Date of Defense 2006-06-29 Date of Submission 2006-07-31