Electrophoresis Of Carbon Nanotubes Cold Cathode Field Emission Properties

Flat panel display is a very important component in television, mobile phone and some mobile divices.in present, the main flat panel display is the LCD and LED, but their performance is still lagging behind with the CRT, and with the development of vacuum microelectronics, FED the monitor has been developed and performance has obvious advantages, but complex technology, high production costs lead to it did not large-scale application. Carbon nanotubes was found in 1991, because of its good electrical conductivity, large aspect ratio, high mechanical strength, chemical stability, make it have good field emission properties, and thermal CVD method to make carbon nanotubes can be large-scale produced, making carbon nanotubes as a very good option of the FED cathode. So, this thesis a major research content is:Using the electrophoresis to produece the carbon nanotubes cold cathode of FED, and through comparative expriments to optimize electrophoresis liquid ratio, basement, electrophoresis voltage, electrophoresis time to echieve the deposition thin films a relatively good field emission performance. The canbon nanotubes film which it is use the optimized conditions to produced. Its threshold electric field is 3.4v/um, and the maximum current density is 2 mA/ cm2, and it can satisfy the current density demand of the FED.In order to further enhance the field emission performance of carbon nanotubes thin films, we use anneal, current and plasma to treat the thin film, and research their field emission performance, the result show that three treat methods all can boose the field emission performance of carbon nanotubes thin film.Compared to the direct growth method and screen printing carbon nanotubes film, one of the advantages is that electrophoresis can be easily achieved by electrophoretic deposition on the curved surface. Therefore, we can electrophoretic deposition the carbon nanotubes on cylinder. It will be applied on the surface and fluorescent display device.Current magnetron activated slowly and large heat loss, but cold magnetron can overcome these disadvantages, and due to it special structure of the magnetron cathode, the electron is emission from the cylinder profile, if we prduce the cylindrical cold cathode, maybe achieve the cold magnetron. The other research point is:Electrophoresis deposit the carbon nanotubes on the Cu cylinder profile, expect it will be applied on the surface and fluorescent display device. In order to use the secondry electrons of the cathode, we research deposit the carbon nanotubes on the cathode of magnetron and its field emission.