Multi-layer conductor with carbon nanotubes

A touchscreen comprising in order a touching electrode, spacer elements, a conductive carbon nanotube layer, a discrete continuous conductive layer comprising electronically conductive polymer, and a substrate, wherein the conductive carbon nanotube layer is formed over and is in contact with the discrete continuous conductive layer comprising an electronically conductive polymer, and wherein said electronically conductive polymer comprises a polythiophene and a polyanion, wherein said polythiophene has the following formula

• in a cationic form, wherein each of R1 and R2 independently represents hydrogen or a C1-4 alkyl group or together represent an optionally substituted C1-4 alkylene group or a cycloalkylene group, an ethylene group, an optionally alkyl-substituted methylene group, an optionally C1-12 alkyl- or phenyl-substituted 1,2-ethylene group, a 1,3-propylene group or a 1,2-cyclohexylene group;
• and n is 3 to 1000;
• wherein said carbon nanotube layer contains carbon nanotubes that are functionalized with covalently attached hydrophilic groups comprising carboxylic acid or carboxylic acid salt, or mixtures thereof, or sulfur-containing group selected from:
• SOxZy, wherein x ranges from 1-3, Z is a hydrogen atom or a metal cation and y ranges from 0 or 1, or mixtures thereof.

A method of forming an electronically conductive article comprising:

• A) applying a conductive layer composition to a substrate to form a continuous conductive layer, and
• B) after drying said continuous conductive layer, forming at least one conductive carbon nanotube layer over and in contact with said dried continuous conductive layer, during which the dried continuous conductive layer remains discrete, and said dried discrete continuous conductive layer comprises an electronically conductive polymer, wherein said electronically conductive polymer comprises a polythiophene and a polyanion, wherein said polythiophene has the following formula
• in a cationic form, wherein each of R1 and R2 independently represents hydrogen or a C1-4 alkyl group or together represent an optionally substituted Cl-4 alkylene group or a cycloalkylene group, an ethylene group, an optionally alkyl-substituted methylene group, an optionally C1-12 alkyl- or phenyl-substituted 1,2-ethylene group, a 1,3-propylene group or a 1,2-cyclohexylene group;
• and n is 3 to 1000;
• and wherein said carbon nanotube layer contains carbon nanotubes that are functionalized with covalently attached hydrophilic groups comprising carboxylic acid or carboxylic acid salt, or mixtures thereof or a sulfur-containing group selected from:
• SOxZy, wherein x ranges from 1-3, Z is a hydrogen atom or a metal cation and y ranges from 0 or 1, or mixtures thereof.