Nanopatterned articles produced using surface-reconstructed block copolymer films
Nanopatterned surfaces are prepared by a method that includes forming a block copolymer film on a substrate, annealing and surface reconstructing the block copolymer film to create an array of cylindrical voids, depositing a metal on the surface-reconstructed block copolymer film, and heating the metal-coated block copolymer film to redistribute at least some of the metal into the cylindrical voids. When very thin metal layers and low heating temperatures are used, metal nanodots can be formed. When thicker metal layers and higher heating temperatures are used, the resulting metal structure includes nanoring-shaped voids. The nanopatterned surfaces can be transferred to the underlying substrates via etching, or used to prepare nanodot- or nanoring-decorated substrate surfaces.
1. A nanopatterned article, comprising:
a substrate; and
a metal-decorated block copolymer film in contact with a surface of the substrate;
wherein the metal-decorated block copolymer film has a thickness and comprises a continuous phase and a dispersed phase comprising a hexagonal array of cylindrical domains extending through the thickness of the film;
wherein the hexagonal array has an orientation order of at least 0.9 over an area of at least 1 centimeter 2 ;
wherein the continuous phase comprises a major phase of the block copolymer;
wherein the dispersed phase comprises a minor phase of the block copolymer and nanodots comprising metal; and
wherein the nanodots in the dispersed phase constitute at least 50 weight percent of the metal content of the article.
2. A nanopatterned article, comprising:
a substrate;
a metal-decorated block copolymer film in contact with a surface of the substrate; and
a metal layer in contact with a surface of the metal-decorated block copolymer film opposite the substrate;
wherein the metal-decorated block copolymer film comprises a block copolymer and metal nanodots;
wherein the metal layer defines an array of essentially circular voids, each circular void disposed above a nanodot; and
wherein each circular void is separated by a nearest-neighbor distance of 10 to 100 nanometers.