Post-processing approach for improving lager-area carbon nanotube cathode field emission uniformity
A carbon nanotube cathode and carbon nanotube technology, applied in cold cathode manufacturing, discharge tube/lamp manufacturing, electrode system manufacturing, etc., can solve the problems of inability to selectively remove carbon nanotubes, high power, low efficiency, etc. , to achieve the effect of realizing large-area rapid processing, realizing in-situ selective processing, and improving the uniformity of field emission
Active Publication Date: 2013-02-27
SUN YAT SEN UNIV
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Problems solved by technology
The post-processing technologies being developed include high-current bombardment, plasma bombardment and laser ablation, etc., but their disadvantage is that they will destroy other carbon nanotubes while removing higher carbon nanotubes, and cannot selectively The removal of carbon nanotubes higher than the surface can be done efficiently; large power and slow speed are required when processing large-area samples; the processing and testing processes are separated, which is inefficient
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Embodiment 1
[0033] The present invention will be further described below in conjunction with accompanying drawing:
[0034] Such as figure 1 as shown, figure 1 It is a schematic diagram of the processing device adopted in the post-processing method of the present invention, wherein, 1 is an ITO flat conductive glass, 2 is a cathode mounting frame, 3 is a carbon nanotube cathode, 4 is a vacuum chamber, 5 is an air intake valve, and 6 is an exhaust valve. Air valve, 7 is a power supply, 8 is a video camera, and 9 is a monitoring screen.
[0035]In this embodiment, the carbon nanotube cathode 3 is used as the carbon nanotube film. The carbon nanotube film is a 5-inch carbon nanotube lattice sample prepared on a silicon wafer substrate by a thermal chemical vapor deposition method, the image point diameter is 200 μm, and the total number of lattices is 19,200. The microscopic morphology of the carbon nanotube film is shown in Fig. 2(a). It can be seen from the figure that the height distr...
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A post-processing approach for improving lager-area carbon nanotube cathode field emission uniformity comprises the following steps that: a field emission apparatus is formed by an anode plate and a cathode mounting rack, wherein a carbon nanotube cathode is fixedly installed on the cathode mounting rack; the field emission apparatus is put in a vacuum cavity with a high degree of vacuum; the anode plate and the cathode are respectively connected with two poles of a power supply; the power supply provides voltage, which makes the carbon nanotubes which have higher heights and higher conductivity in the cathode emit emissions firstly; oxygen with a certain pressure is fed into the vacuum cavity so that the carbon nanotubes which emit emissions firstly can be burnt quickly and can be removed; properties of the rest of the carbon nanotubes tend to consistent so that the field emission uniformity can be raised. In the post-processing approach, a camera and a monitoring screen are also arranged to real-timely observe field emission images and measure field emission characteristics.
Description
technical field [0001] The invention relates to a post-treatment method for improving the uniformity of carbon nanotube cathode field emission. Background technique [0002] Carbon nanotubes are an excellent field emission material, which has the characteristics of low open electric field, high current density and high current stability. It may be used as a cold cathode electron source in devices such as field emission displays and planar light sources, and has important development prospects in the application of display and light emitting industries. At this stage, prototypes of field emission displays and planar light sources based on carbon nanotube cold cathodes have been launched, but the progress of industrial mass production is slow, and there are still some unresolved technical problems in the research work. Among them, the poor uniformity of the field emission site distribution of large-area carbon nanotube films is a major problem that limits its application. Un...
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IPC IPC(8): H01J9/02
Inventor 许宁生张宇邓少芝陈军
Owner SUN YAT SEN UNIV