Patent ID: 8646175

Claim:
A method for making a conductive film exhibiting electric anisotropy, comprising: (A) forming a nanomaterial on a substrate, the nanomaterial having a cluster of interconnected nanounits, each of the nanounits being substantially transverse to the substrate and having one end bonded to the substrate; (B) stretching the nanounits along a first direction in a plane of stretching to remove the nanomaterial from the substrate so as to form a conductive film having strings of interconnected nanounits, wherein the nanounits of the strings substantially extend in the first direction; and (C) stretching the conductive film formed in step (B) along a second direction so as to enlarge an area of the conductive film and so as to increase a transmittance of the conductive film, wherein the second direction is distinct from the first direction and is perpendicular to the first direction in the plane of stretching, wherein the stretching of the conductive film in the second direction is performed by one of mechanical stretching and blowing stretching.