Diameter-Dependence of the Morphology of PS-b-PMMA Nanorods Confined Within Ordered Porous Alumina Templates

Authors

  • Yiming Sun,

    1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany
    2. Department of Engineering, Institute of Materials Science, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
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  • Martin Steinhart,

    Corresponding author
    1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany
    • Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany. Fax: +49 345 5511223
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  • Danilo Zschech,

    1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany
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  • Rameshwar Adhikari,

    1. Department of Engineering, Institute of Materials Science, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
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  • Goerg H. Michler,

    1. Department of Engineering, Institute of Materials Science, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
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  • Ulrich Gösele

    1. Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle (Saale), Germany
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Abstract

Summary: Polystyrene-block-poly(methyl methacrylate) nanorods were prepared by wetting ordered porous alumina templates. We systematically investigated the diameter-dependence of their morphologies by varying the pore diameters of the templates from 400 nm down to 25 nm. If the pore diameter exceeds the period of the block copolymer, the pores accommodate a non-integer number of repeat periods. In case of smaller pores the occurrence of an ordered state could not be unambiguously verified.

original image

TEM image of an ultra-thin slice containing a cross-section of a polystyrene-block-poly(methyl methacrylate) nanorod embedded in epoxy resin.

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