Transparent thin polythiophene films having improved...

C - Chemistry – Metallurgy – 08 – G

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C08G 61/00 (2006.01) C08G 61/12 (2006.01) C08L 65/00 (2006.01) H01B 1/00 (2006.01) H01B 1/12 (2006.01) H01L 51/00 (2006.01)

Patent

CA 2683839

Optically transparent, conductive polymer compositions and methods for making them are claimed. These conductive polymer compositions comprise an oxidized 3,4- ethylenedioxythiopene polymer, a polysulfonated styrene polymer, single wall carbon nanotubes and/or metallic nanoparticles. The conductive polymer compositions can include both single wall carbon nanotubes and metallic nanoparticles. The conductive polymer compositions have a sheet resistance of less than about 200 Ohms/square, a conductivity of greater than about 300 siemens/cm, and a visible light (380-800 nm) transmission level of greater than about 50%, preferably greater than about 85% and most preferably greater than about 90% (when corrected for substrate). The conductive polymer compositions comprising single wall carbon nanotubes are made by mixing the oxidized 3,4-ethylenedioxythiopene polymer and polysulfonated styrene polymer with single wall carbon nanotubes and then sonicating the mixture. The conductive polymer compositions comprising metallic nanoparticles are made by a process of in situ chemical reduction of metal precursor salts.

La présente invention concerne des compositions polymères conductrices et optiquement transparentes, ainsi que leurs procédés de fabrication. Ces compositions polymères conductrices comprennent un polymère de 3,4-éthylènedioxythiopène oxydé, un polymère de styrène polysulfoné, des nanotubes de carbone monofeuillet et/ou des nanoparticules métalliques. Les compositions polymères conductrices peuvent comporter à la fois des nanotubes de carbone monofeuillet et des nanoparticules métalliques. Ces compositions polymères conductrices présentent une résistance série inférieure à environ 200 ohms/carré, une conductivité supérieure à environ 300 siemens/cm et un taux de transmission de la lumière visible (380-800 nm) supérieur à environ 50 %, de préférence supérieur à environ 85 % et, mieux encore, supérieur à environ 90 % (en données corrigées du substrat). Les compositions polymères conductrices comprenant des nanotubes de carbone monofeuillet sont obtenues en mélangeant le polymère de 3,4-éthylènedioxythiopène oxydé et le polymère de styrène polysulfoné avec des nanotubes de carbone monofeuillet, puis en soumettant le mélange à une sonication. Les compositions polymères conductrices comprenant des nanoparticules métalliques sont fabriquées par un procédé de réduction chimique in situ de sels d'un précurseur métallique.

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