Fabrication And Optimization Treatment Of The Carbon Nanotube Film Cathode For FED

Nano material field is one of the hotspots of the2lth material scientific research. In all of them, carbon nanotube (CNT) is a special kind of carbon nano-material, which has unique physical and chemical properties to become the most useful research material. CNT is constructed by one or more sheets of graphite to form the one-dimension tubular structure. It has a high ratio of length-diameter and surface area, excellent chemical stability, mechanical strength and electrical conductivity, together with that the tubular structure’s top and defect are great electron emission ends. As a result, CNT becomes one of the most potential field emission cathode materials after W and Si, which has low turn-on voltage, high field emission current density and so on. At the beginning of the paper, we describe the CNT’s structure and property as the basic knowledge. Secondly, we introduce the methods of sample characterization and preparation; specifically introduce the chemical vapor deposition preparation method in detail, which is the most common method we use. Then we prepare the CNT film cathodes through screen-printing process, and post process them using plasma technology. The experiment proves that the CNT film cathode which is treated under the H2:C2H2=80:20sccm plasma has the best field emission display property. At last, we propose the CNT-FED devices’current problems and related resolutions.Chapter Ⅰ IntroductionIn this chapter, the discovery and development of carbon nanotube, together with its structure feature and classification are reviewed. Because of the unique structure, the CNT has remarkable mechanical, electromagnetic, optical and adsorptive performance characteristics, which has great application prospect in composite material, catalytic chemistry, medical engineering, electron device and other fields. The CNT-FED field is detailed introduced among all of the application, and it’s also the key point of the paper.Chapter II Methods of sample characterization and preparationIn this chapter, the methods of sample characterization are discussed firstly for the analysis of sample morphology and display results afterwards. Secondly, three ways to prepare CNT are presented specially, including the chemical vapor deposition method(the main preparation method in our experiment), the arc discharge method and the laser ablation method. In the end, we introduce the process to make FED cathode and anode paste as the preparation of CNT-FED.Chapter Ⅲ Fabrication of FED device and post processing of CNT film cathodeIn this chapter, the post processing of CNT film cathode using plasma technology is mainly discussed. Though the screen-printing process, we make a4x4pixel FED format, which has higher FED property after the H2/C2H2plasma post processing. The experiment result shows that H2:C2H2=80:20sccm plasma is the best processing condition. It is the base of large scale matrix display.