Patent ID: 8603836

Claim:
A method for producing a transparent CNT electrode, the method comprising: (a) preparing a CNT composition comprising a CNT and conductive dispersant; (b) forming a CNT thin film on a surface of a transparent substrate with the CNT composition; and (c) doping the conductive dispersant contained in the CNT thin film, wherein the dispersant is a compound having a structure in which a head selected from groups represented by Formula 1 is substituted with one tail or two tails that are the same or different, and selected from groups represented by Formula 2: [Ar—(X) a ] l (1) wherein Ar is a C 6 aromatic group or a C 4 -C 5 heteroaromatic group containing at least one heteroatom selected from sulfur (S), nitrogen (N) or oxygen (O), X is NH— or CH═CH—, a is 0 or 1, and l is an integer from 5 to 60, YO b m CH 2 n Z (2) wherein Y is selected from the group consisting of substituted and unsubstituted C 1 -C 10 alkylene groups, substituted and unsubstituted C 1 -C 10 alkenylene groups, substituted and unsubstituted C 1 -C 10 alkynylene groups, and substituted and unsubstituted C 6 -C 20 arylalkylene groups, Z is selected from the group consisting of —H, —CH 3 , —OH, carboxylic acid and its salts, sulfonic acid and its salts, and phosphoric acid and its salts, b is 0 or 1, m is an integer from 1 to 9, and n is an integer from 0 to 9, wherein the transparent CNT electrode has a visible light transmittance of 60% or more at a wavelength of 550 nm or 600 nm measured at a transparent CNT thin film thickness of about 150 nm and a transparent substrate thickness of about 150 μm.