Patent ID: 8207048

Claim:
A method for making a nanostructured surface, comprising: providing a main substrate comprising a base substrate, a superficial crystalline film on top of the base substrate and a barrier layer between the base substrate and the superficial crystalline film, the crystalline film having in a crystalline zone a network of at least one of crystalline defects and stress fields; attacking the superficial crystalline film, wherein the attacking preferentially removes the crystalline film at least one of the crystalline defects and the stress fields, or at the crystalline zone, wherein the attacking removes the crystalline film at the locations of preferential attack to expose the barrier layer beneath the crystalline film and to form nanometric scale protrusions of the crystalline film on the barrier layer, wherein the protrusions are separated from each other by hollows having a base portion on the barrier layer, wherein the nanometric scale protrusions form the nanostructured surface.