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Thin-film morphologies of block copolymers with nanoparticles

Published online by Cambridge University Press:  09 March 2015

Dieter Jehnichen ,
Doris Pospiech ,
Peter Friedel ,
Guping He ,
Alessandro Sepe ,
Jianqi Zhang ,
Christine M. Papadakis ,
Rosa Taurino  and
Jan Perlich
Dieter Jehnichen*
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, D-01069 Dresden, Germany
Doris Pospiech
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, D-01069 Dresden, Germany
Peter Friedel
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, D-01069 Dresden, Germany
Guping He
Affiliation:
Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, D-01069 Dresden, Germany
Alessandro Sepe
Affiliation:
Physik Department, Technische Universität München, Fachgebiet Physik weicher Materie James-Franck-Straße 1, D-85748 Garching, Germany
Jianqi Zhang
Affiliation:
Physik Department, Technische Universität München, Fachgebiet Physik weicher Materie James-Franck-Straße 1, D-85748 Garching, Germany
Christine M. Papadakis
Affiliation:
Physik Department, Technische Universität München, Fachgebiet Physik weicher Materie James-Franck-Straße 1, D-85748 Garching, Germany
Rosa Taurino
Affiliation:
University of Modena and Reggio Emilia, Via Universita 4, I-41121 Modena, Italy
Jan Perlich
Affiliation:
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg, Germany
*
a)Author to whom correspondence should be addressed. Electronic mail: djeh@ipfdd.de
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Abstract

Diblock copolymers (BCPs) show phase separation on mesoscopic length scales and form ordered morphologies in both bulk and thin films, the latter resulting in nanostructured surfaces. Morphologies in thin films are strongly influenced by film parameters, the ratio of film thickness and bulk domain spacing. Laterally structured polymer surfaces may serve as templates for controlled assembly of nanoparticles (NPs). We investigated the BCP of poly(n-pentyl methacrylate) and poly(methyl methacrylate) which show bulk morphologies of stacked lamellae or hexagonally packed cylinders. Thin films were investigated by atomic force microscopy and grazing-incidence small-angle X-ray scattering. For film thicknesses f well below dbulk, standing cylinder morphologies were observed in appropriate molar ratios, while film thicknesses around and larger than dbulk resulted in cylinders arranged parallel to surface. To alter and/or improve the morphology also in presence of different NPs (e.g., silica, gold), solvent vapour annealing (SVA) was applied. The BCP morphology usually remains unchanged but periodicities change depending on type and amount of incorporated NPs. It was found that silica clusters enlarge lateral distances of cylinders, whereas Au NPs reduce it. The effect of SVA is weak. The quality of morphology is slightly improved by SVA and lateral distances remain constant or are slightly reduced.

Keywords

X-ray scatteringblock copolymersphase separationthin filmsnanoparticles
Type
Technical Articles
Information
Powder Diffraction , Volume 30 , Supplement S1 , June 2015 , pp. S16 - S24
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Copyright
Copyright © International Centre for Diffraction Data 2015 

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