Carbon nanotube having improved conductivity, process of preparing the same, and electrode comprising the carbon nanotube
Provided are a method of doping carbon nanotubes, p-doped carbon nanotubes prepared using the method, and an electrode, a display device or a solar cell including the carbon nanotubes. Particularly, a method of doping carbon nanotubes having improved conductivity by reforming the carbon nanotubes using an oxidizer, doped carbon nanotubes prepared using the method, and an electrode, a display device or a solar cell including the carbon nanotubes are provided.
1. A method of doping carbon nanotubes, the method comprising:
preparing an oxidizer solution comprising an oxidizer and an organic solvent; and
doping carbon nanotubes using the oxidizer solution,
wherein the oxidizer is a compound of chemical formula 1:
where M is hydrogen, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 7 -C 30 arylalkyl group, a substituted or unsubstituted C 7 -C 30 alkylaryl group, Ag, Li, Cs, K, NO, NO 2 , or ClCO, and
R 1 and R 2 are each independently a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 1 -C 20 heteroalkyl group, a substituted or unsubstituted C 2 -C 20 alkenyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 6 -C 30 heteroaryl group,
wherein one more hydrogen atom in R 1 and R 2 is substituted for —CF 3 .
2. The method of claim 1 , wherein the doping of the carbon nanotubes comprises
mixing a carbon nanotube powder with the oxidizer solution and
stirring the mixture.
3. The method of claim 1 , wherein the organic solvent promotes dispersion of the carbon nanotubes.
4. The method of claim 1 , wherein the organic solvent is selected from the group consisting of dimethylformamide (DMF), 1,2-dichloro ethane (DCE),1,2-dichloro benzene (ODCB), nitromethane, tetrahydrofuran (THF), N-methylpyrrolidone (NMP), dimethyl sulfoxide, nitrobenzene butyl nitrite, and a combination comprising at least one of the foregoing organic solvents.
5. The method of claim 1 , wherein the oxidizer solution further comprises a dispersing agent.
6. The method of claim 1 , wherein the doping of the carbon nanotubes comprises dipping or coating a film formed of the carbon nanotubes using the oxidizer solution.
7. The method of claim 1 , wherein the organic solvent has oxidizability.
8. The method of claim 7 , wherein the organic solvent having oxidizability is selected from the group consisting of nitromethane, dimethyl sulfoxide, nitrobenzene, butyl nitrite, and a combination comprising at least one of the foregoing solvents.
9. The method of claim 1 , wherein
the sulfonylimides of chemical formula 1 is a sulfonylimides of chemical formula 1 below:
where M is hydrogen, a substituted or unsubstituted C 1 -C 20 alkyl group, a substituted or unsubstituted C 6 -C 30 aryl group, a substituted or unsubstituted C 7 -C 30 arylalkyl group, a substituted or unsubstituted C 7 -C 30 alkylaryl group, Ag, Li, Cs, K, NO, NO2, or ClCO, and
X 1 and X 2 are each independently a substituted or unsubstituted C 1 -C 20 alkylene group, a substituted or unsubstituted C 1 -C 20 heteroalkylene group, a substituted or unsubstituted C 2 -C 20 alkenylene group, a substituted or unsubstituted C 6 -C 30 arylene group, a substituted or unsubstituted C 6 -C 30 heteroarylene group.