Study on Growth Mechanism and Field Emission Properties of Carbon Nanotubes

• Main Authors: You-Ming Tsau, 曹佑民
• Other Authors: Hsiu-Fung Cheng
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/88828014600689443080

碩士 === 國立臺灣師範大學 === 物理研究所 === 90 === In this thesis, it includes three major topics: local area growth control, In-situ spectroscopic characterization, and electron field emission properties of carbon nanotubes (CNTs). In order to control the growth area, “microwave inducing arc discharge” and “high-voltage arc discharge on diamond thin films” were used. It has been successful to grow the carbon nanotubes with gas or liquid catalysts by microwave inducing arc discharge method. The growth mechanism of CNTs by using microwave inducing arc discharge method can be explained by “diffusion growth model” and “step-flow growth model”. By using high-voltage arc discharge method, it can grow the carbon nanotubes on the diamond thin films without catalysts. The growth mechanism of CNTs on diamond thin films by using high-voltage arc discharge is similar to the growth of carbon nanotubes by traditional arc discharge method. In order to study the growth mechanism of carbon nanotubes, microwave plasma enhanced CVD was utilized, and the In-situ spectroscopic characterization was proceeded during the growing process. The optical emission spectrum of the microwave enhanced plasma was diagnosed by the optical multi-channel analyzer (OMA) during the growing process. It provides the information about the species and the growth temperature, which are helpful to understand the growth mechanism of CNTs. The electron field emission properties of carbon nanotubes, which were synthesized by the microwave heating chemical vaper deportations (MHCVD) method, was measured at various temperatures with lased-irradiation-induced process. The electron field emission properties were improved during the lased-irradiation-induced process. The electrical property of carbon nanotubes was evaluated by using Fourier Transform Infrared (FTIR) spectroscopy. The electron field emission properties and electrical properties were investigated.