Production of carbon nanotubes by the electric-arc technique using polymer materials

• Main Authors: Yu-Hsiang Wang, 王裕祥
• Other Authors: Yuan-Yao Li
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/26592965888065265588

碩士 === 國立中正大學 === 化學工程研究所 === 91 === Abstract This thesis aims at three researches. The first research probes into the prescription on paper to make carbon nanotubes(CNTs).We use the mixtures of graphite powder and iron powder,and hope to manufacture high yields of CNTs. The results of experiment indicate that the introduction of small amounts of iron catalyst is favorable for the formations of CNTs. The weight ratio of graphite powder to iron powder is equal to 9 to 1 that causes the highest yields of the formations of CNTs. The images of SEM show that CNTs form mostly on the surface of like-wool ball structure, and the diameter of CNTs is about 16~79 nm. From the paper, it is known that use iron powder as catalyst and is helpful to the formations of single-wall carbon nanotubes. When the additive of iron catalyst is excess, it is unfavorable to form CNTs, but only the formation of carbide iron. The second reseach intends to use other new catalysts such as Fe2(SO4)3•nH2O, Fe(NO3)3•9H2O in place of iron powder.We grind uniformly the mixture of new catalyst and graphite powder on a mortar, and then fill into the anode graphite rod. We hope to increase the yields of CNTs or produce other novel construction. From our experiments, we obtain the results that the additive of Fe2(SO4)3•nH2O would cause the thicker diameter of CNTs, the diameter of CNTs is about 63~313 nm and fill a lot of spherical particles into CNTs. The additive of Fe2(SO4)3•nH2O would also generate numerous like-wool ball structures, and CNTs mix with other impurities, the diameter of CNTs is about 35.7~71.4 nm. The third reseach intends to use new carbon sources PVA, PEG in place of graphite powder and well mixed with iron group catalyst(Fe, Fe2(SO4)3•nH2O, Fe(NO3)3•9H2O) and then fill into the anode graphite rod. The results of experiment indicate that dope fully PVA into the anode graphite rod without catalyst, it will form not only CNTs but also other novel structure, such as chain-ball like structure, colloid-like structure, sheet-like structure.