Method for forming UV-patternable conductive polymer film
According to a method for forming a UV patternable conductive polymer film, vapor-phase polymerization (VPP) may be employed to synthesize a conductive polymer, and a UV-curable polymer resin may be used as a binder to form a conductive polymer film, the method including coating a mixed solution of a binder and an oxidant on a transparent substrate, synthesizing a conductive polymer by vapor-phase polymerization (VPP) on the coating to form a conductive polymer film and patterning the conductive polymer film with UV light. The conductive polymer film may be patterned in a relatively simple manner while maintaining increased conductivity, improved transparency and improved flexibility. Therefore, the conductive polymer film may be used as a material for transparent electrodes of a variety of display devices, e.g., LCD and PDP devices, and electronic devices, e.g., ELs and TFTs.
1. A method for forming a conductive polymer film, the method comprising:
coating a mixed solution of a photosensitive polymer resin and an oxidant on a transparent substrate without the use of an additional binder;
synthesizing a conductive polymer by vapor-phase polymerization (VPP) on the coating to form a conductive polymer film; and
patterning the conductive polymer film with UV light,
wherein the photosensitive polymer resin is selected from the group consisting of polyester acrylate resins and epoxy acrylate resins.
2. The method according to claim 1 , wherein the oxidant is selected from the group consisting of ferric toluene sulfate (FTS), CuCl 3 , FeCl 3 , Cu(ClO 4 ) 2 .6H 2 O, AuCl 3 , MgCl 2 , Fe(ClO 4 ) 3 , NiCl 2 , H 2 PtCl 5 .6H 2 O, Na 2 PdCl 4 , CuCl 2 , iron dodecyl benzene sulfonate, iron anthraquinone sulfonate, and (HAuCl 4 .4H 2 O)AgNO 3 .
3. The method according to claim 1 , wherein the photosensitive polymer resin is mixed with the oxidant in a weight ratio of about 1:5 to about 1:100.
4. The method according to claim 1 , wherein the transparent substrate is a flexible substrate.
5. The method according to claim 1 , wherein the transparent substrate is surface-treated by O 2 plasma.
6. The method according to claim 1 , wherein the mixed solution further contains a dopant.
7. The method according to claim 1 , wherein the conductive polymer is synthesized by vaporizing a monomer and bringing the monomer vapor into contact with the coated substrate to cause polymerization of the monomer with the oxidant on the surface of the substrate.
8. The method according to claim 7 , wherein the monomer is selected from the group consisting of pyrrole, thiophene, furan, selenophene, 2,3-dihydrothio-3,4-dioxin and their derivatives.
9. The method according to claim 7 , wherein the monomer is 3,4-ethylenedioxythiophene.
10. The method according to claim 1 , wherein the vapor-phase polymerization is performed for about 2-about 3 minutes.
11. The method according to claim 1 , wherein the vapor-phase polymerization is performed at a temperature of about 50° C.-about 100° C.
12. The method according to claim 1 , wherein the UV patterning is performed by UV irradiation at a wavelength of about 365 nm for about 3-about 6 minutes.
13. The method according to claim 1 , wherein patterning the conductive polymer film with UV light further includes washing unreacted oxidant remaining after the patterning.