Method of forming a uniform carbon nanotube electron-emission layer in a field emission display
First Claim
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1. A method of forming a carbon nanotube electron-emission layer in a field emission display, comprising the sequence of steps as follows:
- a) providing a carbon nanotube suspension by adding water as a solvent, uniformly adding 5% to 20% by weight of carbon nanotube which is shorter than 1 micron, 1% to 10% by weight of dispersant for motivating the carbon nanotube dispersing in the suspension, and 1% to 10% by weight of antifoam in the solvent for eliminating foams or bubbles caused by stirring;
b) vibrating and stirring the mixture of water, dispersant, antifoam and carbon nanotube for a predetermined period of time;
c) adding stabilizer in the mixture for prolonging storage life of the suspension and the carbon nanotube having sufficient time to disperse and stirring the mixture;
d) adding 5% to 20% by weight of coalescing aid for the suspension easily being attached to a glass substrate of a field-emission display, 1% to 5% by weight of adhesion promoter for increasing adhesion of the suspension so as to control a film thickness formed on the glass substrate and stirring the mixture;
e) sieving the mixture by a mesh to form a low-viscosity carbon nanotube suspension as low as 24 cps (centipoises), wherein a proportion of solid component is about 14% by weight, wherein the dispersant performs chemical dispersion such that the carbon nanotube in the suspension is not agglomerate, and the suspension is easily coated into a uniform form to be used for forming a uniform electron-emission layer in the field-emission display; and
f) performing a vacuum sintering process, in which the carbon nanotube of the suspension is directly attached to a cathode substrate to form the electron emission layer without requiring an adhesive additive of glass powder to prevent a deposit density of the carbon nanotube in the suspension from being diluted by addition of the adhesive additive.
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Abstract
A carbon nanotube suspension uses water as the basic solvent added with dispersant, stabilizer, coalescing aid, adhesion promoter, and a carbon nanotube. The basic solvent and the above solutes form a low viscosity solvent with carbon nanotube suspending therein. Therefore, the carbon nanotube suspension is formed to serve as a source material of the electron emission source of a field-emission display. That is, the carbon nanotube can be coated on a surface for forming the carbon nanotube electron-emission layer.
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Citations
8 Claims
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1. A method of forming a carbon nanotube electron-emission layer in a field emission display, comprising the sequence of steps as follows:
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a) providing a carbon nanotube suspension by adding water as a solvent, uniformly adding 5% to 20% by weight of carbon nanotube which is shorter than 1 micron, 1% to 10% by weight of dispersant for motivating the carbon nanotube dispersing in the suspension, and 1% to 10% by weight of antifoam in the solvent for eliminating foams or bubbles caused by stirring; b) vibrating and stirring the mixture of water, dispersant, antifoam and carbon nanotube for a predetermined period of time; c) adding stabilizer in the mixture for prolonging storage life of the suspension and the carbon nanotube having sufficient time to disperse and stirring the mixture; d) adding 5% to 20% by weight of coalescing aid for the suspension easily being attached to a glass substrate of a field-emission display, 1% to 5% by weight of adhesion promoter for increasing adhesion of the suspension so as to control a film thickness formed on the glass substrate and stirring the mixture; e) sieving the mixture by a mesh to form a low-viscosity carbon nanotube suspension as low as 24 cps (centipoises), wherein a proportion of solid component is about 14% by weight, wherein the dispersant performs chemical dispersion such that the carbon nanotube in the suspension is not agglomerate, and the suspension is easily coated into a uniform form to be used for forming a uniform electron-emission layer in the field-emission display; and f) performing a vacuum sintering process, in which the carbon nanotube of the suspension is directly attached to a cathode substrate to form the electron emission layer without requiring an adhesive additive of glass powder to prevent a deposit density of the carbon nanotube in the suspension from being diluted by addition of the adhesive additive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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