Combinatorial study of surface pattern formation in thin block copolymer films
AP Smith, JF Douglas, JC Meredith, EJ Amis… - Physical Review Letters, 2001 - APS
Physical Review Letters, 2001•APS
Surface pattern formation in diblock copolymer films is investigated as a function of film
thickness h and molecular mass M. Smooth films are observed for certain h ranges centered
about multiples of the lamellar thickness L 0, and we attribute this effect to an increase in the
surface chain density with h in the outer brushlike copolymer layer. We also observe
apparently stable labyrinthine surface patterns for other h ranges, and the average size of
these patterns is found to scale as λ∼ L 0− 2.5. Hole and island patterns occur for h ranges …
thickness h and molecular mass M. Smooth films are observed for certain h ranges centered
about multiples of the lamellar thickness L 0, and we attribute this effect to an increase in the
surface chain density with h in the outer brushlike copolymer layer. We also observe
apparently stable labyrinthine surface patterns for other h ranges, and the average size of
these patterns is found to scale as λ∼ L 0− 2.5. Hole and island patterns occur for h ranges …
Abstract
Surface pattern formation in diblock copolymer films is investigated as a function of film thickness h and molecular mass M. Smooth films are observed for certain h ranges centered about multiples of the lamellar thickness L 0, and we attribute this effect to an increase in the surface chain density with h in the outer brushlike copolymer layer. We also observe apparently stable labyrinthine surface patterns for other h ranges, and the average size of these patterns is found to scale as λ∼ L 0− 2.5. Hole and island patterns occur for h ranges between those of the labyrinthine patterns and the smooth regions, and their size similarly decreases with L 0 and M.
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