Patent ID: 8461511

Claim:
A photo-sensitive composite film comprising a plurality of metal nanoparticles and an anodized aluminum oxide film, wherein the anodized aluminum oxide film is made of a porous material with nano-pores and has a first surface, a second surface opposite to the first surface and a plurality of long tube shaped holes, therewith each of the holes having a first end and a second end, the first end having an opening at the first surface of the anodized aluminum oxide film, the second end of the hole being closed and located at the second surface of the anodized aluminum oxide film, the closed second end being covered by an aluminum oxide layer, and the plural metal nanoparticles being completely contained in the holes and resting at the bottom of the holes; and the photo-sensitive composite film is capable of changing its conductivity by light exposure on the metal nanoparticles from one or both of the first surface and the second surface of the anodized aluminum oxide film.