| Summary: | 碩士 === 國立清華大學 === 先進光源科技學位學程 === 98 === In this study, a simple thermal pyrolysis chemical vapor deposition technique which was used alcohol vapor as the carbon source was synthesized high purity single-walled carbon nanotube on silicon substrate by double-layered catalytic system, and this sample was used a lift-off technique with BOE solution subsequently. After those processes, the SWCNT-networks successfully were separated from the silicon substrate. The lifted-off SWCNT-networks which has excellent optical and electrical properties was transferred the suspended SWCNT-networks to various substrates, and proceeded with chemical modification of reduction and oxidation treatment.
Chemical modification focused primarily on the reducing agent (hydrazine) treatment in SWCNT-networks. As the results of this experiment showed, the surface of SWCNT-networks which were treated by hydrazine has bonded to their sidewalls using amino groups. This situation was induced a spontaneous charge transfer that was led to the doping effect, and the change of SWCNT-networks’ conductivity. The phenomenon of charge transfer was analyzed by the four-point probe systems, field emission scanning electron microscope, Raman spectroscopy, X-ray Photoemission spectroscopy, and Ultra-violet Photoelectron spectroscopy. Though those analyses was investigated the pristine and reacted SWCNT-networks properties of conductive characteristics, the sidewall structure, chemical bonding species and valence bond electronic structure. Those overall results provide a comprehensive exploration.
This paper was also compared the characteristics of hydrazine treatment with acid treatment. We have proposed the reduction effect by hydrazine treated pre-oxidized SWCNT-networks.
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