Patent ID: 7888129

Claim:
A structured substrate comprising: (a) a monolithic polymeric film comprising: a base having first and second opposed major surfaces, wherein at least a portion of the first major surface is at least partially defined by: a patterned microstructure outwardly extending from the base; and nanostructure having an average height of at least 100 and less than 200 nanometers, wherein the nanostructure is at least partially encompassed within, or overlaps, the patterned microstructure, wherein the nanostructure consists of discrete nanofeatures at an areal density of at least about 1×10 8 nanofeatures/cm 2 and wherein the projected area of the nanostructure onto the base of the film is at least 50% more than the corresponding surface area of the base; and (b) a metal layer conformably disposed on at least a portion of the nanostructure, wherein the structured substrate is flexible.