Mass Production of Ultralong Carbon Nanotubes

• Main Authors: CHANG, TING-WEI, 章庭瑋
• Other Authors: CHEN, CHIEN-CHONG
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/tj23fw

碩士 === 國立中正大學 === 化學工程研究所 === 105 === The carbon source used in this experiment is alcohol (99.5%), the catalyst source is ferrocene, and the promoter thiophene. 60g of alcohol is mixed with different amounts of ferrocene and thiophene to produce catalyst precursor. The catalyst precursor is injected into a high-temperature alumina tube and vaporized into steam. Argon is used as the carrier gas which brings the catalyst precursor steam into the hot reaction zone inside the tube. The carbon nanotubes generated in the reaction zone would flow in the tube. For mass production, a bottle is attached to the end of the aluminum tube to collect the newly-fabricated carbon nanotubes. This thesis further discusses the different parameters such as reaction temperature, the time at which the carbon nanotubes remain in the high temperature zone, ferrocene concentration, thiophene concentration, argon flow rate, injection rate and the addition of C2H2 which is used to increase the length, purity and amount of fabricated nanotubes. At the moment, the experiment is being carried out with the following parameters: reaction temperature at 1200℃, ferrocene 0.5wt%, thiophene 1.2wt%, the flow proportion of Ar:C2H2 is 400:100 sccm and the injection rate set to be 80 ml/hr in our work. With the above parameters, CNTs of the average length 600~1200 μm can be successfully fabricated, and the longest can reach 2000 μm.