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URN etd-0827108-195126 Statistics This thesis had been viewed 2630 times. Download 460 times. Author Guang-Jhe Shih Author's Email Address No Public. Department Materials Engineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 74 Title Synthesis of Carbon Nanotubes using Fe-Co/MgO Catalysts by Chemical Vapor Deposition Keyword purification chemical vapor deposition carbon nanotubes carbon nanotubes chemical vapor deposition purification Abstract Abstract
Fe-Co/MgO catalysts were prepared by immersion of MgO powders in the solution containing Fe and Co, and carbon nanotubes (CNTs) were synthesized using chemical vapor deposition. Different Fe-Co/MgO catalysts with the same catalyst concentration but different Fe/Co ratios were used. Experimental results show that the highest carbon yield was obtained when using the Fe/MgO catalyst at the growth temperature of 810℃ and that compacted CNT bundles of several micrometers in length, protruded out of the catalyst surface, were observed. When the growth temperature was raised, the carbon yield decreased and the CNT bundle had a network-like morphology. For the Fe-Co/MgO and Co/MgO catalysts, better growth temperature was 850℃ but the difference was small between 800℃ and 950℃. CNTs with a smaller diameter distribution were observed when the Co content in the Fe-Co/MgO catalyst was increased according to the Raman and TEM analyses. Better purification result was obtained when using H2O2 and HCl two step treatments as compared to HNO3 treatment. The treatment of H2O2 can remove the amorphous carbon and facilitate the removal of catalysts by HCl.
Advisor Committee Shinn-Shyong Tzeng - advisor
Che-hung Wei - co-chair
Jiung-Shiun Hsu - co-chair
Files Date of Defense 2008-07-30 Date of Submission 2008-09-17