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Preparation of Functional Silica Using a Bioinspired Method
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Engineering Nitroxide Functional Surfaces Using Bioinspired Adhesion.

Hendrik Woehlk1, Jan Steinkoenig1, Christiane Lang

  • 1Macromolecular Architectures, Institute for Chemical Technology and Polymer Chemistry , Karlsruhe Institute of Technology (KIT) , Engesserstr. 18 , 76128 Karlsruhe , Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 15, 2018
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Summary
This summary is machine-generated.

We developed a new method to create polymer films with persistent radical character using mussel-inspired chemistry. These versatile nitroxide-containing coatings can be applied to various materials for potential use in electronic devices.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Engineering

Background:

  • Surface modification is crucial for tailoring material properties.
  • Mussel-inspired chemistry offers a versatile platform for surface functionalization.
  • Nitroxide radicals are key components in redox-active materials.

Purpose of the Study:

  • To develop a novel surface modification strategy for creating nitroxide-containing polymer films.
  • To investigate the polymerization of a 3,4-dihydroxy-l-phenylalanine (l-DOPA) monomer functionalized with a TEMPO-derived group.
  • To explore the potential applications of these polymer films in electronic devices.

Main Methods:

  • Oxidative catecholamine polymerization of a DOPA-TEMPO monomer.
  • One-step dip-coating of various substrates (silicon, titanium, alumina, PTFE).
  • Characterization using ellipsometry, atomic force microscopy, X-ray photoelectron spectroscopy, electrospray ionization mass spectrometry, and cyclic voltammetry.

Main Results:

  • Successful one-step coating of diverse materials with poly(DOPA-TEMPO) thin films under aerobic, alkaline conditions.
  • Polymer growth rate of approximately 1.1 nm/h was observed and confirmed by AFM.
  • Analysis revealed oligomeric structures with dihydroxyindole units and persistent nitroxide radicals.
  • Demonstrated reversible redox activity of the nitroxide polymer coatings.

Conclusions:

  • A versatile surface modification strategy using mussel-inspired polymerization was established.
  • The developed poly(DOPA-TEMPO) films possess persistent radical character and reversible redox activity.
  • These findings present a facile route to electrochemically active nitroxide polymer coatings for applications in organic radical batteries and other electronic devices.