Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 5: Interfaces
CPP 5.6: Vortrag
Montag, 23. März 2009, 11:45–12:00, ZEU 160
Lateral structures of buried interfaces in ABA-type tri-block copolymer films — •Peter Müller-Buschbaum1, Leander Schulz2, Ezzeldin Metwalli1, Jean-Francois Moulin1,3, and Robert Cubitt4 — 1TU München, Physikdepartment E13, James-Franck-Str.1, 85747 Garching (Germany) — 2Uni. de Fribourg, Phys. Dept., Chemin du Musee 3, 1700 Fribourg (Switzerland) — 3Inst. für Werkstoffforschung, GKSS, 21502 Geesthacht (Germany) — 4ILL, 6 rue Jules Horowitz, 38042 Grenoble (France)
The lateral structure of an A-B-A type tri-block copolymer polyparamethylstyrene-block-polystyrene-block-polyparamethylstyrene at the buried silicon substrate interface is studied as a function of different substrate surface energies. With grazing incidence small angle neutron scattering (GISANS) high interface sensitivity is reached. With GISANS the orientation and the degree of order of the morphology are probed. The powder-like oriented lamellar structure in the bulk becomes oriented along the surface normal in the vicinity of the substrate. A modification of the short-ranged interface potential of the substrate introduces a stretching of the lateral spacing of this lamellar structure up to 8 % as compared to the bulk. The decay of the stretching towards the volume structure is probed with depth profiling. It extends at least up to a distance of 51 nm from the solid surface. [1]
[1] P.Müller-Buschbaum, et al.; Langmuir Letter, 24, 7639-7644 (2008) and P.Müller-Buschbaum, et al.; Langmuir ASAP (DOI 10.1021/la802471p)