Carbon Nanotube Film Cathode Electrophoresis Electroplating Method And Field Emission Performance Study

Carbon nanotubes(CNT) have unique mechanical, chemical and electronic properties and have a wide range of applications in different fields, especially in the field offlat panel display. Therefore, the study of carbon nanotube field emission properties hasgreat significance. The use of the electrophoresis and plating method with simpleequipment produce excellent field emission properties and low cost carbon nanotubefilm cathode plating crystalline particles of the silver. we systematically study fieldemission properties of carbon nanotube film cathode prepared by electrophoresis andoverlying silver plated crystalline particle, and achieves certain results. The maincontent of the paper include the following aspects：1. In this dissertation, the experiments select the transparent ITO film of indium tinoxide glass as a conductive electrode of electrophoresis, and use photolithography andetching techniques to prepare conductive pole of the gate level structure graphicallyelectroplating. The machine is set to3000r/min of low speed for3s and5000r/min ofhigh speed for30s to prepare of a uniform film thickness of1149nm and photoresistwas prepared to clear graphical pattern of photoresist by exposure3s and developing10s.ITO film is etched in35°C for310s to prepare level gate structure graphics cathode.2. In this dissertation, carbon nanotube films is deposited on the surface of thecathode ITO glass graphical by using of electrophoresis, and study in detail the surfacemorphology and field emission properties of carbon nanotube film deposited by usingdifferent electrophoretic process parameters. When the carbon nanotube con centrationis0.1g/L and aluminum nitrate concentration is0.066g/L, when thevoltage is100velectrophoresis60seconds to get the best carbon nanotube film that has the best surfacemorphology and field emission properties.3. In order to improve the electrochemical contact between the carbon nanotubefilm and the ITO surface, and improve the field emission properties of the carbonnanotube films, using electroplating method electroplate silver crystalline particles onthe surface of the carbon nanotube films. After annealing, silver crystalline particles weld between the carbon nanotube films and ITO films, and excellent electricalconductiveity of the nano-silver is effective in improving the contact of the carbonnanotube films and ITO films in order to eliminate the interface barrier between thecarbon nanotube films and ITO films and greatly improved the performance of thecathode field emission.4. In this dissertation, we systematically study the properties of cathode fieldemission with plating and not plating silver crystalline particles on the surface of thecarbon nanotube films. The experimental results show that turn-on voltage of cathodeplating silver crystalline is reduced, and the field emission current density increases.And also in-depth study that annealing influences field emission properties of thecathode sample. Experimental results show that annealing can further improveelectrochemical contact between the carbon nanotube films and ITO films, effectivelyreduce the contact resistance and improve the field emission properties.5. In this dissertation, we systematically study properties of level gate structurecathode field emission. The experimental results show that the gate do play a significantrole in modulate cathode current density, and the field emission properties of level gatestructure is better than the diode structure field emission properties.