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Electrophoretic ink and method for preparing carbon nanotube field emission array by using same
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A carbon nanotube and field emission technology, applied in electrophoretic plating, electrode system manufacturing, discharge tube/lamp manufacturing, etc., can solve the problems of unmanufacturable area, difficulty, complicated manufacturing method, etc., and improve the alignment accuracy. , to avoid the effect of short circuit
Inactive Publication Date: 2011-10-05
IRICO
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[0004] A field emission display device using conventional carbon nanotubes as an emitter tip is superior to a field emission display device using a silicon emitter tip in terms of stability, but a field emission display device using conventional carbon nanotubes is in the future. Carbon nanotubes are difficult to place in electrical conductors and their fabrication is complicated
Therefore, field emission display devices using conventional carbon nanotubes have low yields and cannot be fabricated with a large area
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Embodiment 1
[0033] Example 1 A method for preparing carbon nanotube field emission arrays by electrophoretic deposition
[0034] Figure 2 ~ Figure 6 It is a schematic diagram of an embodiment of preparing a carbon nanotube field emission array by using an electrophoretic deposition method in the present invention.
[0035] As shown in the figure, after the cathode substrate 1 is ultrasonically cleaned with acetone, the manufacturing process is performed in the following steps:
[0036] 1) On the glass substrate of the cathode substrate 1, print the entire surface of the conductive silver paste as the cathode electrode layer 2, and dry it at 100° C. under atmospheric pressure for 20 to 30 minutes; then use photolithography to obtain the pattern of the cathode electrode layer, and expose , development; the exposure energy is 500mJ, and the developing solution is 0.4% sodium carbonate solution;
[0037] 2) The cathode electrode layer 2 was sintered at 570°C for 20 minutes under atmospheri...
Embodiment 2
[0062] The preparation method of the electrophoretic liquid and the specific steps of the electrophoretic precipitation are the same as the above-mentioned steps, and the difference from Example 1 is that the composition and ratio of the electrophoretic liquid are different.
[0063] Wherein the percentage by weight of the ethanol of analytical pure grade is 98%; The percentage by weight of solute part is magnesium chloride is 0.8%, the percentage by weight of ethyl cellulose is 0.50%, the percentage by weight of dodecanethiol is 0.60%, the percentage by weight of carbon nanotube The percentage by weight is 0.10%.
Embodiment 3
[0065] The preparation method of the electrophoretic liquid and the specific steps of the electrophoretic precipitation are the same as the aforementioned steps, and the difference from Example 1 is that the composition and ratio of the electrophoretic liquid are different.
[0066] Wherein the mixture (mixed in any proportion) of isopropyl alcohol (isopropyl alcohol-IPA) of analytical grade and acetone and ethanol is 98.8% by weight; the solute part is 0.2% by weight of aluminum chloride, and the The weight percentage is 0.40%, the weight percentage of dodecanethiol is 0.57%, and the weight percentage of carbon nanotubes is 0.03%.
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Abstract
The invention relates to an electrophoretic ink and a method for preparing carbon nanotube field emission array by using same. The electrophoretic ink is characterized by comprising the following raw materials by weight percent: 98%-99% of solvent, 0.20%-0.80% of inorganic salt, 0.10%-0.50% of ethylene cellulose, 0.10%-0.30% of dodecyl mercaptan and 0.03%-0.10% of carbon nanotube. The method of the invention comprises the following steps: coating a cathode electrode layer on a glass substrate, exposing under light for development to obtain strip cathode patterns, coating an insulating medium layer on the cathode electrode layer, coating a gate electrode layer on the insulating medium layer, using photosensitive silver paste to prepare strip electrodes, intersecting the strip electrodes and the cathode electrode layer to prepare a mask, etching the insulating medium layer, and finally sintering the gate electrode layer; and preparing an insulating film on the gate electrode layer, thenplacing a lower substrate in the electrophoretic ink, adding DC voltage, performing electrophoresis, and sintering carbon nanotubes to expose the surface of the gate electrode. The method of the invention can be used to increase the filling precision of the emitting material and avoid the short circuit phenomenon between the cathode electrode and the gate electrode.
Description
technical field [0001] The invention belongs to the technical field of field emission display manufacture, and specifically relates to an electrophoretic liquid for preparing a carbon nanotube field emission array by an electrophoretic deposition method and a method for preparing a carbon nanotube field emission array by an electrophoretic deposition method. Background technique [0002] Carbon nanotubes are a special cold cathode material with high aspect ratio, small tip curvature radius, and can emit a large number of electrons under the action of an applied voltage, which has attracted people's attention. [0003] Traditional carbon nanotubes are synthesized by electron discharge method or laser deposition method, put into a clean solution and shaken with an ultrasonic scrubber to refine it. The refined carbon nanotubes are grafted into holes of a porous ceramic filter to apply the refined carbon nanotubes to a field emission device. [0004] A field emission display de...
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