Abstract
The general strategies for achieving macroscopic order in thin block copolymer films typically utilize external stimuli and activation energies, which become less effective with increasing the film thickness to ∼0.5–1 µm. Here we show a facile and effective approach towards multi-level control over lamella orientation and order in thick diblock copolymer films. The novel finding concerns the reorientation of lamella domains relative to the substrate upon annealing under a selective solvent, and is combined with alignment of the lamellar director along a preferred direction by simultaneous application of an electric field. The multiple approach yields a method for the single step fabrication of a striped nanostructure with a controlled orientation and long-range order of the microdomains.
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