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The European Physical Journal E

, Volume 8, Issue 4, pp 355–363 | Cite as

Hole nucleation in thin diblock copolymer films

  • S. Joly
  • D. Ausserré
  • G. Brotons
  • Y. Gallot
Article

Abstract:

This paper reports an experimental study of a homogeneous nucleation process in the direct space, using an atomic-force microscope. Nucleated patterns are holes in a thin diblock copolymer film. The formation of nuclei from the metastable majority phase is followed either by the dissolution or by the growth of the hole. It is also preceded by the unexpected presence of a bump at the free surface. From the study of the nucleus surface topography at different stages of the evolution, we infer a description of the nucleation mechanism at a molecular level. It involves the existence of ordered metastable states characterized by the presence of compressed internal layers, the formation of pores in the center of the film, and the existence of interfacial flows across these pores. The presence of compressed internal layers was directly demonstrated using Neutron Reflectivity experiments, Our scheme is also consistent with all existing experimental data. After hole nucleation, we identify two distinct growth regimes: the first one is individual and the second one is interactive.

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2002

Authors and Affiliations

  1. 1.Université du Maine, UMR CNRS no 6515, ENSIMLe Mans Cedex 9France
  2. 2.Institut Laue LangevinGrenoble Cedex 9France
  3. 3.Institut Charles SadronStrasbourg CedexFrance

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