Patent ID: 8075951

Claim:
A method of forming an electrically conductive membrane comprising: sequentially depositing, under pH controlled conditions, a mixture of a colloid and a charged polymer on a surface to form a plurality of layers comprising a first layer and a second layer; wherein the surface is a porous surface; said first layer is deposited from a mixture of a first colloid and a first polymer selected from the group consisting of polyallylamine hydrochloride, polydiallyldimethylammonium chloride, poly(dimethylamine-co-epichlorohydrin), linear poly(ethyleneimine), and poly(aniline); said second layer is deposited from a mixture of a second colloid and a second polymer selected from the group consisting of polyacrylic acid, polymethacrylic acid, polystyrene sulfonate, poly(2-acrylamido-2-methyl-1-propane sulfonic acid), oligoethylene glycol dicarboxylic acid, poly(styrene sulfonic acid-maleic acid), and poly(acryl-co-acrylamide acid); said first colloid consists essentially of a carbon powder, a metal or a combination thereof; and said second colloid consists essentially of a carbon powder, a metal or a combination thereof.