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URN etd-0729104-102110 Statistics This thesis had been viewed 2852 times. Download 363 times. Author Hui-Hung Chien Author's Email Address No Public. Department Materials Engineering Year 2003 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 100 Title Synthesis of Single Walled Carbon Nanotubes upon Magnesium Oxide by Catalytic Chemical Vapor Deposition Keyword Single-walled carbon nanoubes Raman spectra Magnesium Oxide Magnesium Oxide Raman spectra Single-walled carbon nanoubes Abstract Carbon nanotubes（CNTs）were discovered by Iilima in 1991, they have attracted worldwide attentions due to their excellent properties by their special structures. The processing parameters of growing carbon nanotubes include the deposition temperature, deposition pressure, types of the carbon sources, flow rate and deposition time etc. In this study, we used the magnesium oxide as the substrate of the cobalt catalysts and we investigated the effects of the following parameters, including the catalyst concentration, deposition time, the methane flow, deposition temperature, the hydrogen flow and the specific surface area. Experimental results indicated that carbon nanotubes can be synthesized successfully upon the magnesium oxide by catalytic chemical vapor deposition. These carbon nanotubes were almost the single walled carbon nanotubes（SWNTs）and tend to align together to form a bundle morphology. From the Raman spectra and TEM, the diameter of the SWNTs was about 0.86-1.23nm. The yield of CNTs was better as the catalyst with concentrations of Co/MgO=1.5, 2.5 and 5wt%. Besides, the CNTs were thickened for a long deposition time. And the acid treatment of the as-grown samples in 900℃ was efficient for removing the magnesium oxide without damaging the CNTs structures because that there was no deposition of amorphous carbon on the magnesium oxide. Advisor Committee Shinn-Shyong Tzeng - advisor
Han C. Shih - co-chair
Jiin-Jyh Shyu - co-chair
Files Date of Defense 2004-07-06 Date of Submission 2004-07-29