Method for preparing carbon nanotubes, carbon nanotube films, and electronic devices

Abstract

A method for preparing carbon nanotubes for synthesizing carbon nanotubes, fabricating carbon nanotube films and electronic devices is provided. The method for preparing carbon nanotubes can repair the defects in side walls of carbon nanotubes under stable condition easily and prepare carbon nanotubes of excellent properties. The method utilizes uric acid solution or ammonia water to treat carbon nanotubes after acidifying the carbon nanotubes by refluxing with nitric acid. The treatment temperature is, for example, 25° C.˜90° C., and treatment time is at least two 2 days. Preferably, the carbon nanotubes are treated with thionyl chloride solution before being treated with uric acid solution or ammonia water.

1 . A method for preparing carbon nanotubes, comprising:
 treating acid-refined carbon nanotubes with a solution of a compound having an amino group or ammonia water.   
     
     
         2 . The method for preparing carbon nanotubes according to  claim 1 , further comprising:
 treating the carbon nanotubes with a solution of a compound which reacts with a carboxyl group to produce —COCl, before treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water.   
     
     
         3 . The method for preparing carbon nanotubes according to  claim 1 , wherein,
 the compound having an amino group is a compound of which the amino group reacts with a carboxyl group to substitute the hydroxyl group in the carboxyl group.   
     
     
         4 . The method for preparing carbon nanotubes according to  claim 2 , wherein,
 the compound which reacts with a carboxyl group to produce —COCl is at least one selected from the group consisting of SOCl 2 , (COCl) 2 , PCl 3 , POCl 3 , and PCl 5 .   
     
     
         5 . The method for preparing carbon nanotubes according to  claim 1 , wherein,
 the treatment with the solution of a compound having an amino group is performed at a temperature equal to or higher than 25° C. and lower than the boiling point of the solvent of the solution of a compound having an amino group.   
     
     
         6 . The method for preparing carbon nanotubes according to  claim 1 , wherein,
 the treatment with the solution of a compound having an amino group is performed at a temperature not lower than 25° C. and not higher than 90° C.   
     
     
         7 . The method for preparing carbon nanotubes according to  claim 1 , wherein,
 the carbon nanotubes are single-walled carbon nanotubes.   
     
     
         8 . A method for preparing carbon nanotube films, comprising:
 preparing a carbon nanotube film with carbon nanotubes obtained by treating acid-refined carbon nanotubes with a solution of a compound having an amino group or ammonia water.   
     
     
         9 . The method for preparing carbon nanotube films according to  claim 8 , comprising:
 preparing the carbon nanotubes by treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water.   
     
     
         10 . The method for preparing carbon nanotube films according to  claim 9 , further comprising:
 treating the carbon nanotubes with a solution of a compound which reacts with a carboxyl group to produce —COCl, before treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water.   
     
     
         11 . A method for fabricating electronic devices, comprising:
 preparing carbon nanotubes or films thereof by treating acid-refined carbon nanotubes with a solution of a compound having an amino group or ammonia water; and   fabricating the electronic devices with the carbon nanotube or films thereof.   
     
     
         12 . The method for fabricating electronic devices according to  claim 11 , comprising:
 preparing the carbon nanotubes by treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water.   
     
     
         13 . The method for fabricating electronic devices according to  claim 11 , comprising:
 preparing the carbon nanotube films with the carbon nanotubes which are prepared by treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water.   
     
     
         14 . The method for fabricating electronic devices according to  claim 11 , comprising:
 preparing the carbon nanotubes by treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water; and   preparing the carbon nanotube films with the carbon nanotubes.   
     
     
         15 . The method for fabricating electronic devices according to  claim 14 , further comprising:
 treating the acid-refined carbon nanotubes with a solution of a compound which reacts with a carboxyl group to produce —COCl, before treating the acid-refined carbon nanotubes with the solution of a compound having an amino group or ammonia water.