TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The carbon nanotube is single-wall carbon nanotubes or multi-wall carbon nanotubes manufactured by chemical vaporous deposition method, arc discharged method, solar energy method, template method or laser evaporation method. The organic acid is nitric acid having concentration of 1-35 weight%, sulfuric acid having concentration of 1-55 weight% or hydrochloric acid having concentration of 1-50 weight%. The oxidizing acid is nitric acid having concentration of 0.1-70%, sulfuric acid having concentration of 1-100%, mixed solution of potassium permanganate and sulfuric acid in the molar ratio of 1/100-100/1, mixed solution of nitric acid and sulfuric acid in the molar ratio of 1/100-100/1, mixed solution of potassium permanganate and nitric acid in the molar ratio of 1/100-100/1, mixed solution of hydrogen peroxide and sulfuric acid in the molar ratio of 1/100-100/1, mixed solution of hydrogen peroxide and hydrochloric acid in the molar ratio of 1/100-100/1 and/or mixed solution of hydrogen peroxide and nitric acid in the molar ratio of 1/100-100/1.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The diamine is ethanediamine, polyethanediamine, 1,2-propanediamine, 1,3-propanediamine, 1,2-butanediamine, 1,3-butanediamine, 1,6-hexamethylenediamine, p-phenylenediamine, diaminocyclohexane, m-phenylenediamine, dichloro diphenylmethane, menthanediamine, chlorinated hexamethylenediamine, chlorinated nonamethylene diamine, chlorinated decamethylene diamine, dodecamethylene diamine and/or tridecane diamine. The polyamine is triethylamine, n-triamine, N-ethylpiperazine, dicyandiamide, hexanedioic acid, N,N-dimethyl dipropylenetriamine, pentamethyldiethylenetriamine, N,N,N,N,N-pentamethyl-diethylene triamine, tetraethylene pentamine, diethylenetriamine, triethylene tetramine and/or pentaethylenehexamine. The organic solvent benzene, methylbenzene, styrene, butyltoluene, perchloroethylene, trichloroethylene, vinyltoluene, ethylene glycol monovinyl ether, dichloromethane, carbon disulfide, triorthocresol phosphate, carbinol, ethanol, isopropanol, cyclohexane, cyclohexanone, toluene cyclohexanone, diethyl ether, epoxypropane, acetone, methyl isobutyl ketone, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, acetonitrile, pyridine, chlorobenzene, dichlorobenzene, dichloromethane, trichloromethane, carbon tetrachloride, trichloroethylene, tetrachloroethylene, trichloropropane, dichloroethane, N,N-dimethylformamide, dimethyl sulfoxide, dioxane and/or tetrahydrofuran. The condensing agent is N,N'-dicyclohexylcarbodiimide, N,N'-diisopropyl carbodiimide and/or 1-ethyl-3-dimethylamine propyl carbodiimide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The carbon fiber is long fiber, fiber cloth or short fiber. The polyimide is thermoplastic polyimide or thermosetting polyimide.