| Summary: | 碩士 === 國立中興大學 === 化學工程學系所 === 98 === The purpose of this study is to prepare a novel trasparent carbon nanotubes thin film with complex material, and utilize a simple coating techonolgy to fabricate cathode of a field-emission display.A nanoscale Ni-Mg bimetal catalyst was prepared by chemical reduction method and was used to grow the mutipule-wall carbon nanotubes(MWCNTs). The prepared MWCNTs/ZnO complexing solution was coated on ITO substrate by spining coating method to manufacture a cathode.
According to the experimental results, the optimal acidic treatment of the carbon nanotubes is 4hr, and the extended treatment can destroy the structure of the carbon nanotubes. The field emission has the best efficiency when the concentration of ZnO is reached to 0.2M. The TEM and SEM results show that the higher ZnO concentration will entrap the carbon nanotubes and decrease the performance of field emission. In addition, the light transmittion decrease with increasing the coating layers on ITO substrate. By considering the effects of field emission and light transmission, the optimal coating layers on ITO is 5 layers carbon-nanotubes/ZnO thin film, and the optimal acidic treatement is 4hr for a betters field emission efficiency. In addition, the higher calcinations temperatures cause the oxidation of carbon nanotubes and the changing color of PVP, and decrease the light transmission of the materials. The best calcination temperature has proofed to be 350℃.
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