Toward Photopatternable Thin Film Optical Sensors Utilizing Reactive Polyphenylacetylenes

Authors

  • Anja C. Pauly,

    1. Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, D-20146 Hamburg, Germany
    2. Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
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  • Patrick Theato

    Corresponding author
    1. Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, D-20146 Hamburg, Germany
    2. Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
    3. School of Chemical and Biological Engineering, WCU Program of Chemical Convergence for Energy & Environment (C2E2), College of Engineering, Seoul National University, 151-744, Seoul, Korea
    • Institute of Technical and Macromolecular Chemistry, University of Hamburg, Bundesstraße 45, D-20146 Hamburg, Germany.
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Abstract

Substituted polyphenylacetylenes featuring reactive pentafluorophenyl (PFP) ester moieties are synthesized. Parts of the reactive PFP groups are then converted with a mono ortho-nitrobenzyl-protected diamine in variable ratios. Thin films are prepared from these copolymers and irradiated with UV light (λ = 365 nm), resulting in crosslinking of the irradiated areas and hence enabling a photopatterning. We found that during the photocrosslinking process, the excess of PFP ester moieties is stable and remained intact, enabling a subsequent post-polymerization modification step with amines. Noteworthy, this subsequent modification with amines results in a dramatically shift in the UV–vis absorption spectra, rendering these patterned conjugated polymer films ideal candidates for optical sensors.

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