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Preparation of Reactive Three-Dimensional Microstructures via Direct Laser Writing and Thiol-ene Chemistry

Authors

  • Alexander S. Quick,

    1. Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76131 Karlsruhe, Germany
    2. Institut für Angewandte Physik, Institut für Nanotechnologie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Wolfang-Gaede-Straße 1, 76131 Karlsruhe, Germany
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  • Joachim Fischer,

    1. Institut für Angewandte Physik, Institut für Nanotechnologie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Wolfang-Gaede-Straße 1, 76131 Karlsruhe, Germany
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  • Benjamin Richter,

    1. Institute of Zoology and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Haid-und-Neu-Str.9 (MRI), 76131 Karlsruhe, Germany
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  • Thomas Pauloehrl,

    1. Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76131 Karlsruhe, Germany
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  • Vanessa Trouillet,

    1. Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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  • Martin Wegener,

    Corresponding author
    1. Institut für Angewandte Physik, Institut für Nanotechnologie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Wolfang-Gaede-Straße 1, 76131 Karlsruhe, Germany
    • Institut für Angewandte Physik, Institut für Nanotechnologie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Wolfang-Gaede-Straße 1, 76131 Karlsruhe, Germany.
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  • Christopher Barner-Kowollik

    Corresponding author
    1. Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76131 Karlsruhe, Germany
    • Preparative Macromolecular Chemistry, Institut für Technische Chemie und Polymerchemie and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Engesserstraße 18, 76131 Karlsruhe, Germany
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Abstract

Three-dimensional microstructures are fabricated employing the direct laser writing process and radical thiol-ene polymerization. The resin system consists of a two-photon photoinitiator and multifunctional thiols and olefins. Woodpile photonic crystals with 22 layers and a rod distance of 2 μm are fabricated. The structures are characterized via scanning electron microscopy and focused ion beam milling. The thiol-ene polymerization during fabrication is verified via infrared spectroscopy. The structures are grafted in a subsequent thiol-Michael addition reaction with different functional maleimides. The success of the grafting reaction is evaluated via laser scanning microscopy and X-ray photoelectron spectroscopy. The grafting density is calculated to be close to 200 molecules μm−2.

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