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Keywords:

  • Block copolymers;
  • Self-assembly;
  • Thin films
Thumbnail image of graphical abstract

A new way to control the characteristic dimensions of morphologies in polymer systems is demonstrated with a mixture of a block copolymer and a small amount of homopolymer. Controlled solvent annealing and casting produces long-range order over large areas for the blends (see Figure), and through the selective removal of the homopolymer, almost defect-free arrays of nanoscopic holes are produced in the block copolymer film.