Dispersion of carbon material and process for producing same

1. A carbon material dispersion, comprising:

a fluorinated carbon material having a fluorinated surface formed by bringing a treatment gas with a fluorine concentration of 0.01 to 20 vol % into contact with a carbon material under conditions of a treatment time of 4 to 24 hours and a treatment temperature of 150 to 350° C.; and

a dispersion medium in which the fluorinated carbon material is dispersed,

wherein a surface of the fluorinated carbon material is free from fluorine gas and the fluorinated carbon material is added in an amount of 0.001 to 25 vol % based on the total weight of the dispersion to the dispersion medium.

2. The carbon material dispersion according to claim 1 , wherein the fluorinated carbon material has a carbon-fluorine bond introduced into its surface.

3. The carbon material dispersion according to claim 1 , wherein the dispersion medium is a polar solvent.

4. The carbon material dispersion according to claim 1 , wherein the carbon material is carbon nanotubes, carbon nanocoils, fullerene, graphite, carbon black, diamond-like carbon, carbon fibers, or amorphous carbon.

5. A method for producing a carbon material dispersion, comprising the steps of:

bringing a treatment gas with a fluorine concentration of 0.01 to 20 vol % into contact with a carbon material under conditions of a treatment time of 4 to 24 hours and a treatment temperature of 150 to 350° C. to produce a fluorinated carbon material having a fluorinated surface;

performing a vacuum evacuation of the treatment gas;

reducing or removing fluorine gas adsorbed and remaining on the surface of the fluorinated carbon material by introducing an inert gas to reach the atmospheric pressure; and

dispersing the fluorinated carbon material in a dispersion medium

wherein the fluorinated carbon material is added in an amount of 0.001 to 25 vol % based on the total weight of the dispersion to the dispersion medium.

6. The method according to claim 5 , further comprising the steps of: cooling the fluorinated carbon material to room temperature after the step of reducing or removing fluorine gas.

7. The method according to claim 5 , wherein in the fluorination, a carbon-fluorine bond is introduced into a surface of the carbon material.

8. The method according to claim 7 , wherein a polar solvent is used as the dispersion medium.

9. The method according to claim 5 , wherein carbon nanotubes, carbon nanocoils, fullerene, graphite, carbon black, diamond-like carbon, carbon fibers, or amorphous carbon is used as the carbon material.

10. The method according to claim 5 , wherein immediately after the treatment gas is brought into contact with the carbon material, the vacuum evacuation of the treatment gas is performed and the inert gas is introduced so that an inert atmosphere is formed, and the carbon material is cooled to room temperature and then dispersed in the dispersion medium.