Composition for coating organic electrode and method of manufacturing an organic conductive layer having excellent transparency using the composition
The present invention relates to a composition for coating an organic electrode and method of manufacturing an organic electrode having a excellent transparency using the composition comprising 3% to 20% by weight of a polyhydric alcohol, polyol or a mixture thereof, 5% to 10% by weight of a primary alcohol having C1 to C5, 5% to 25% by weight of a amide, sulfoxide or a mixed solvent thereof, 0.01% to 0.1% by weight of a surfactant and a aqueous solution of polyethylenedioxythiophene (PEDOT) conductive polymers having nano-sized particle in a remainder. The present invention indicates the excellent transparency that transmittance of organic conductive layer is more than 90% in the visible ray area and sheet resistance is 300 to 900 Ω/sq in case of coating. Therefore the present invention is capable of manufacturing the organic electrode such a electrode or a writing material of organic transistor, smart card, antenna, electrode of battery and fuel battery, capacitor using for PCB, inductor, electromagnetic wave cover and a sensor etc. as well as the transparency electrode using for display.
1. A composition for coating organic conductive layer comprising: 3% to 20% by weight of a polyhydric alcohol, a polyol or a mixture thereof; 5% to 10% by weight of a primary alcohol having C1 to C5; 5% to 25% by weight of a mixed solvent of an amide and a sulfoxide; 0.01% to 0.1% by weight of a surfactant and aqueous solution of polyethylenedioxythiophene (PEDOT) conductive polymers aqueously dispersed with nano-sized particles when polyethylenedioxythiophene (PEDOT) conductive polymers become nano-sized particles in a remainder; and wherein a concentration of polyethylenedioxythiophene (PEDOT) and polystyrenesulfonate (PSS) solid in the aqueous solution is 1.0% to 1.5% by weight of based on the total weight of solution, wherein a visible ray transmittance of the organic conductive layer is more than 90% in case of coating, wherein a sheet resistance of the organic conductive layer is 300 to 900 Ω/sq.
2. The composition of claim 1 , wherein said polyhydric alcohol, the polyol or the mixture thereof is at least one of alcohols selected from the group consisting of a ethyleneglycol, propyleneglycol, butanediol, neopentyiglycol, diethyleneglycol, triethyleneglycol, methylpentanediol, hexanediol, trimethylolpropane, glycerine, ethylhexanediol, hexanetriol, polyethyleneglycol, polypropylenegylcol, poly oxypropylenetriol, polytetramethyleneglycol, sorbitol, and thereof a derivative.
3. The composition of claim 2 , wherein said molecular weight of polyhydric alcohol or polyol is less than 300.
4. The composition of claim 1 , wherein said amide solution is at least one of solvents selected from the group consisting of a formamide, N methylformamide, N, N-dimethylformamide, aceteamide, N-methylaceteamide, N,N-dimethylaceteamide, N-methylpropionamide, pyrrolidone, N-methylpyrrolidone, caprolactam and a tetramethylurea, and wherein said sulfoxide solvent is at least one of solvents selected from the group consisting of a methylsulfoxide, dimethylsulfoxide, sulfolane and a dimethylsulfone.
5. The composition of claim 1 , wherein said surfactant is at least one of surfactants selected from the group consisting of a nonionic surfactant, anionic surfactant, cationic surfactant and a neutral surfactant, and a HLB(hydrophilic-lipophilic balance) is within 7 to 20.
6. The composition of claim 1 , wherein said composition further comprising of 0.01% to 0.5% by weight of a compound, containing a sulfonic acid as a dopant.
7. The composition of claim 6 , wherein said dopant is at least one of compounds selected from the group consisting of a polystyrenesulfonic acid, p-toluenesulfonic acid, dodecylbenzenesulfonic acid, anthraquinonesulfonic acid, 4-hydroxybenzenesulfonic acid, methylsulfonic acid and a nitrobenzenesulfonic acid.
8. A method of manufacturing an organic conductive layer having excellent transparency comprising: stirring said composition of claim 1 ; spreading out said composition on a transparent substrate; drying up the substrate; and coating 0.2 to 20 μm by thickness of coating layer.
9. A method of manufacturing an organic conductive layer having excellent transparency comprising steps of: stirring said composition of claim 1 ; repeatedly dispersing said composition 2 to 10 times per 3 to 10 minutes with a ultra sonicator controlled by 20,000 to 40,000 Hz of frequency, 50 to 700 W of power; spreading out said dispersed solution on a transparent substrate; drying up the substrate; and coating 0.2 to 20 μm by thickness of coating layer.