TRANSPARENT CONDUCTIVE FILMS WITH CARBON NANOTUBES, INKS TO FORM THE FILMS AND CORRESPONDING PROCESSES

摘要

Inks for the formation of transparent conductive films are described that comprise an aqueous or alcohol based solvent, carbon nanotubes as well as suitable dopants. Suitable dopants generally comprise halogenated ionic dopants. In some embodiment, the inks comprise sulfonated dispersants that can effectively provide additional doping to improve electrical conductivity as well as stabilize the inks with respect to settling and/or improve the fluid properties of the inks for certain processing approaches. The inks can be processed into films with desirable levels of electrical conductivity and optical transparency.

主权项

1. An ink for the formation of a transparent electrically conductive film coating comprising:
an alcohol based solvent or water based solvent, from about 25 to about 2000 micrograms/milliliter (μg/ml) well dispersed carbon nanotubes, from about 0.025 to about 5 weight percent sulfonated dispersant comprising a sulfonate (—SO3) functional group and having a molecular weight of at least about 250 g/mole, and from about 0.1 to about 10 milligrams/ml (mg/ml) an ionic dopant composition, fluorinated fullerenes or a combination thereof, wherein the ionic dopant composition comprises a perhalogenated inorganic anions, trifluoromethylsulfonimide anions, trifluoromethanesulfonate anions or combinations thereof.