Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Interfaces and Thin Films I
CPP 1.9: Vortrag
Montag, 26. März 2012, 12:00–12:15, C 130
Guiding block copolymers into sequenced patterns via inverted terrace formation — •Sungjune Park1, Larisa Tsarkova1, Stephanie Hiltl1, Stefan Roitsch2, Joachim Mayer2, and Alexander Böker1 — 1DWI an der RWTH Aachen e. V., Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen University, D-52056 Aachen, Germany. — 2Gemeinschaftslabor für Elektronenmikroskopie, RWTH Aachen University, Ahornstr. 55, D-52074 Aachen, Germany.
We present a facile one-step route to achieve sequenced patterns from microphase separated structures in asymmetric polystyrene-b-polybutadiene (PS-b-PB) diblock copolymer films. For the guided block copolymer assembly we used topographically corrugated SiCN ceramic substrates which were fabricated by a facile replication process using non-lithographic PDMS masters. Homogeneous block copolymer films have been floated onto the corrugated substrate without significant changes to the corrugations topography. During thermal annealing of PS-b-PB diblock copolymer, the material transport was guided by a wrinkled substrate to form regular modulations in the film thickness. As a consequence of the thickness-dependent morphological behavior, the film surface appears as sequenced patterns of alternative microphase separated structures. The ordering process is attributed to a newly observed phenomenon of inverted terrace formation which is induced by the corrugations on substrate, so that the resulting surface patterns are free from the surface relief structures within macroscopically large areas.