Transparent thin polythiophene films having improved conduction through use of nanomaterials
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United States of America Patent
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Issued Date -
Oct 25, 2007
app pub date -
Apr 10, 2007
filing date -
Apr 11, 2006
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Abstract
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.
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