Patent ID: 8834730
Filing Date: 2014-09-16
Classification: B01D,B82Y,C23C,C23F

Abstract:
1. A method for manufacturing a nanoporous membrane, the method comprising: forming a first protective layer on both surfaces of a substrate; forming a nanoporous thin film having a columnar grain structure by depositing one of metallic materials, oxides, nitrides and fluorides on the first protective layer formed in the upper surface of the substrate through a physical vapor deposition method or a chemical vapor deposition method at a normal temperature or cooling the substrate; forming a second protective layer in the thin film; patterning the first protective layer formed in the lower surface of the substrate to expose a part of the lower surface of the substrate; etching the exposed part of the substrate until a part of the first protection layer underneath the nanoporous thin film is exposed; etching the exposed part of the first protective layer underneath the nanoporous thin film to expose the nanoporous thin film having the columnar grain structure; adjusting the size of the nanopores by etching the exposed lower part of the nanoporous thin film partially in order to remove an amorphous layer formed in the deposition at the normal temperature or cooling the substrate; and etching the second protective layer to remove the second protective layer, wherein the nanopores are formed to be vertical to the substrate between columnar grains, wherein the size of the nanopores varies depending on an increase of a thickness of the nanoporous thin film having the columnar grain structure, wherein the first protective layer is formed of a material having etching selectivity with respect to the substrate and wherein the second protective layer is formed of a material having etching selectivity with respect to the substrate, the first protective layer and the nanoporous thin film.