Method of producing nanopatterned articles, and articles produced thereby
A nanopatterned surface is prepared by forming a block copolymer film on a miscut crystalline substrate, annealing the block copolymer film, then reconstructing the surface of the annealed block copolymer film The method creates a well-ordered array of voids in the block copolymer film that is maintained over a large area. The nanopatterned block copolymer films can be used in a variety of different applications, including the fabrication of high density data storage media.
1. A layered article prepared by a method comprising:
forming a block copolymer film on an annealed, miscut surface of a crystalline substrate; wherein the block copolymer film comprises a major phase and a minor phase; and wherein the block copolymer film comprises a bottom surface in contact with the annealed, miscut surface of the crystalline substrate, and a top surface not in contact with the annealed, miscut surface of the crystalline substrate;
annealing the block copolymer film; and
surface reconstructing the annealed block copolymer film so that the minor phase migrates to the top surface of the block copolymer film, thereby forming voids in the block copolymer film
2. The layered article of claim 1 , wherein the layered article consists of the crystalline substrate and the solvent-reconstructed block copolymer film.
3. The layered article of claim 1 , wherein, after said annealing, the minor phase consists of lines parallel to the plane of the film, and wherein said surface reconstruction results in the formation of linear voids in the block copolymer film.
4. The layered article of claim 1 , wherein, after said annealing, the minor phase consists of cylinders perpendicular to the plane of the block copolymer film, and wherein said surface reconstruction results in formation of cylindrical voids in the block copolymer film.
5. The layered article of claim 4 , wherein the method further comprises
coating a resist from a glancing angle onto the solvent-reconstructed block copolymer film to form an article comprising the substrate, the solvent-reconstructed block copolymer film, and a resist layer; and
etching the article onto and perpendicularly to the resist layer to form cylindrical voids in the substrate.
6. The layered article of claim 4 , wherein the method further comprises
depositing a magnetic material perpendicularly onto the top surface of the solvent-reconstructed block copolymer film and through the pores of the solvent-reconstructed block copolymer film onto the substrate to yield an article comprising a magnetically-decorated substrate and a magnetically-coated block copolymer film; and
separating the magnetically-coated block copolymer film from the magnetically-decorated substrate.
7. The layered article of claim 6 , wherein the article is the magnetically-decorated substrate; and wherein the magnetically-decorated substrate is a memory device having an areal storage density of about 1×10 10 to about 1.5×10 12 bits per square centimeter.