The Study on Growth of Carbon Nanotubes Using Single-pulse Discharge Method
Date Issued
2009
Date
2009
Author(s)
Su, Jia-Shiang
Abstract
The principal methods for producing CNTs have arc discharge method, chemical vapor deposition (CVD) method and laser ablation. Owing to the different applications of CNTs, many methods are created to meet this purpose. The application of CNTs in many fields is hopefully expected. In this research we will offer a new fabrication technology for CNTs by micro electro-discharge machining (MEDM). This method not only can comply with different applications of CNTs but also extend the MEDM method to the CNTs industry.n contrast to the typical CNT preparation method, the current micro-electro discharge method can be used to prepare CNTs under atmospheric environment without the necessity of expensive vacuum system. In this study, a self-design micro electro discharge-system was used to prepare carbon nanotubes. The effect of processing parameters including the applied peak current and pulse duration were investigated. The results reveal that the carbon concentration in the hole is decreased while high current and widen arc width are used, so no CNTs can be obtained. On the other hand, insufficient carbon source and temperature field can provide the energy for CNT growth under low current and narrow arc with. Therefore, the current and arc width play important roles for the CNT growth but no proportional relationship between the parameters and production is observed. The CNTs with tape tip can be prepared under Ip=4A,τ=1200μs under single-pulse discharge, which is benefit for the field emission application. The growth rate is up to 22.5mm/min。t is concluded that the CNTs can be produced by using MEDM even without any protection gas, cooling system, special preparation and cavity. Furthermore, using this simplified equipments and preparation process of MEDM, as another beneficial option, can be applied to producing CNTs in the near future.
Subjects
Micro electro-discharging machining
peak current
pulse duration
single pulse discharge
Type
thesis
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