| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 96 === Desirable electrical, thermal and mechanical properties of carbonnanotubes(CNTs) have fueled a continually growing of theoretical and experimental studies of CNTs in the last 20 years. To data, many properties of single CNTs, horizontal aligned CNTs, and CNT composites have been reported for special applications: thermal conductor, switches and memories in nanoscale electronic devices.
In our research, we focus on the mechanical properties of different diameter of carbon nanotube turf. The wide range of size and large number of carbon nanotube turf grown by chemical vapor deposition are structures for use in microelectronic devices and microelectromechanical systems (MEMS). It is necessary to understand the mechanical properties of carbon nanotube turf rather than a single tube.
The diameter of carbon nanotube is an important factor to influence the single-wall carbon nanotube and the multi-walled carbon nanotube on mechanical properties. Many papers reported that the size of catalyst particles and CNTs grown on special template controlling the diameter of carbon nanotubes. But these methods have a higher cost. In order to reduce the cost of fabricating CNTs, we choose different thickness of iron catalyst, which was formed on top of multilayered substrates of Si/SiO2/Al2O3 by e-beam evaporation. After heating, different size of iron catalyst particle depend on thickness of iron catalyst films. Finally, the different diameters of carbon nanotubes were grown by different size of catalyst particle.
Do the difference diameters of carbon nanotube influence the behavior of an assemblage of CNTs? We measure the mechanical properties of different diameters of carbon nanotube turf using the nanoindentation. The nanoindentation tests reveal that the large diameter exist stronger mechanical properties.
|
|---|
