Ordered Nanoscale Archimedean Tilings of a Templated 3‑Miktoarm Star Terpolymer

The directed self-assembly of 3-miktoarm star terpolymer chains (polyisoprene-<i>arm</i>-polystyrene-<i>arm</i>-polyferrocenylethylmethylsilane (3 μ-ISF)) into 2D Archimedean tilings is described. A morphological change from (4.8²) to (6³) tiling is reported in the 3 μ-ISF thin film blended with PS homopolymer when a greater swelling of PI is achieved during the solvent annealing process. Highly oriented (4.8²) tilings were produced by templating the self-assembled three colored structures in blended thin films. The use of (4.8²) and (6³) tilings as nanolithographic masks to transfer square and triangular hole arrays into the substrate is also demonstrated

Hierarchical Templating of a BiFeO₃–CoFe₂O₄ Multiferroic Nanocomposite by a Triblock Terpolymer Film

A process route to fabricate templated BiFeO₃/CoFe₂O₄ (BFO/CFO) vertical nanocomposites is presented in which the self-assembly of the BFO/CFO is guided using a self-assembled triblock terpolymer. A linear triblock terpolymer was selected instead of a diblock copolymer in order to produce a square-symmetry template, which had a period of 44 nm. The triblock terpolymer pattern was transferred to a (001) Nb:SrTiO₃ substrate to produce pits that formed preferential sites for the nucleation of CFO crystals, in contrast to the BFO, which wetted the flat regions of the substrate. The crystallographic orientation and magnetic properties of the templated BFO/CFO were characterized