Carbon nanotube suspension

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.

1 . A carbon nanotube suspension, comprising: 
 water;    5% to 20% of carbon nanotube;    5% to 20% of coalescing aid;    1% to 5% of adhesion promoter;    0.5% to 5% of stablizer;    1% to 10% of dispersant; and    1% to 10% of antifoam.    
     
     
         2 . The suspension of  claim 1 , wherein the carbon nanotube is no longer than 1 micron.  
     
     
         3 . The suspension of  claim 1 , wherein the dispersant includes ethyl hydroxide or organic methyl eikonogen.  
     
     
         4 . The suspension of  claim 1 , wherein the antifoam includes polypropylene glycol (PPG).  
     
     
         5 . The suspension of  claim 1 , wherein the coalescing aid includes one or a combination of aluminum sodium sulfate, silane coupling agent, alkyd resin or tetra-ethyl-ortho-silicate (TEOS).  
     
     
         6 . The suspension of  claim 1 , wherein the adhesion promoter includes one of PVA, PVP, methyl cellulose, ethyl cellulose, sodium polyacrylate and ammonium polyacrylate.  
     
     
         7 . The suspension of  claim 1 , wherein the stablizer includes one of sodium hydroxide, potassium hydroxide and ammonia.  
     
     
         8 . A method of forming carbon nanotube suspension, comprising: 
 providing water as a solvent, uniformly adding 1% to 10% of dispersant and 1% to 10% antifoam in the solvent;    adding 5% to 20% of carbon nanotube;    vibrating and stirring the mixture of water, dispersant, antifoam and carbon nanotube for a predetermined period of time;    adding stablizer in the mixture and stirring the mixture;    adding 5% to 20% of coalescing aid, 1% to 5% of adhesion promoter and stirring the mixture; and    sieving the mixture by a mesh.    
     
     
         9 . The method of  claim 8 , wherein the carbon nanotube is shorter than 1 micron.  
     
     
         10 . The method of  claim 8 , wherein the dispersant includes ethyl hydroxide or organic methyl eikonogen.  
     
     
         11 . The method of  claim 8 , wherein the antifoam includes polypropylene glycol (PPG).  
     
     
         12 . The method of  claim 8 , wherein the coalescing aid includes one or more than one of aluminum sodium sulfate, silane coupling agent, alkyd resin and tetra-ethyl-ortho-silicate (TEOS).  
     
     
         13 . The method of  claim 8 , wherein the adhesion promoter includes PVA, PVP, methyl cellulose, ethyl cellulose, sodium polyacrylate or ammonium polyacrylate.  
     
     
         14 . The method of  claim 8 , wherein the stablizer includes sodium hydroxide, potassium hydroxide or ammonia.  
     
     
         15 . The method of  claim 8 , wherein the vibration and stirring process includes an ultrasonic vibration and stirring process.  
     
     
         16 . The method of  claim 8 , wherein a 500 mesh is used for sieving the mixture.