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Keywords:

  • colloidal crystal;
  • femtochemistry;
  • interfaces;
  • Janus particle;
  • soft film
Thumbnail image of graphical abstract

Two-faced character in a film: Soft “Janus” two-dimensional colloidal crystal films were made using polystyrene (PS) particles, on an air–water interface as a mold for a flexible polypyrrole layer. By removing the PS particles, an array of femtoliter-sized cups was produced. These two-dimensional colloidal crystal films can also be transferred onto substrates with curvature.