| Summary: | 碩士 === 國立中正大學 === 化學工程所 === 95 === This research was studied on growth of branched CNTs by thermal chemical vapor deposition. The process was mainly including three steps:
First, FeNi powder was dispersed on Si wafer by spinning coater, and producing carbon nanotubes on Si wafer that there was FeNi on by thermal chemical vapor deposition . Second , Ni catalysts was loaded on the first carbon nanotubes by sputter, Ni-coated carbon nanotubes were formed. Third , branched carbon nanotubes were produced by thermal chemical vapor deposition , and Ni coated CNTs were catalytic roles.
By the instruments, ex: SEM,TEM,HR-TEM analysis, we can gain much information. How was the effect by the different parameters, such temperature , the catalytic thickness , the time of the carbon sources. Three conclusion:
1. temperature: the higher temperature, the lower density of branched CNTs
2. the catalytic thickness : the more catalytic thickness , the larger diameters of branched CNTs.
3. the time of carbon sources : the longer time of carbon sources , the higher density of branched CNTs and the longer branched-CNTs .
Otherwise , were there branched CNTs with no new carbon source? Yes, there were. And we were also studying the mechanism about it. Furthermore , discussing the hydrophobic of branched CNTs. The results is that the hydrophobic effect is better with branched carbon nanotubes.
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