Preparation Of Carbon Nanomaterial Field Emission Cathodes Using Pd Catalystic Nanoparticles And Fabrication Of Field Emission Lamps

• Main Authors: Chen,Hung-Lun, 陳弘倫
• Other Authors: Liu,Yi-Ming
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/49498007705565188120

碩士 === 國防大學理工學院 === 材料科學與工程碩士班 === 100 === The field emission (FE) wire cathodes fabricated with carbon nano-coils (CNCs) grown on 304 stainless steel wires were studied in this work. The CNCs were synthesized with thermal chemical vapor deposition (TCVD) using the immerging coated styrene-co-NIPAAm/Pd (St-co-NIPAAm/Pd) as catalysts. The influence of process parameters in the CNC growth stage and the post heat treatment stage on the uniformity of the lighting spots and current of the FE bulb was evaluated. This thesis is composed of three main sections. In the first section, the process parameters such as the different surface pre-treatment of substrates, the growth temperature and the growth time were adjusted in the CNC synthesis to evaluate their effects upon the CNC morphology. In the second section, the synthesized CNCs and carbonaceous products were post-treated with annealing in different ambiance and temperature from 200℃ to 400℃ to evaluate whether the post-treatment can improve the uniformity of cathodoluminescence and field emission current. In the last part, the cathode wires were set up with the anode bulb shell to assemble FE bulbs (FEBs). These bulbs were fabricated with the cathode wires with different wire diameters and lengths to evaluate their effect on the uniformity of the lighting spots and brightness of the bulbs. The results indicate that the FE current in the bulb increased with the decrease of wire diameter or the increase of wire length. When the wire cathode was fabricated with CNCs synthesized at 600℃ for 30 min and post-treated at 200℃ for 30 min in the nitrogen atmosphere, the FE current of the assembled FEB can achieve 4.2 mA at the applied voltage of 10 kV.