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Fabrication of a Postfunctionalizable, Biorepellent, Electroactive Polyurethane Interface on a Gold Surface by
Sezer Özenler1, Yigit Sozen2, Hasan Sahin2
1Department of Chemistry, Izmir Institute of Technology, Gülbahçe, Urla, 35430 Izmir, Turkey.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 28, 2020
Summary
This study introduces surface-assisted urethane polymerization for creating thin, functional polyurethane interfaces. This method yields modular, biorepellent, and electroactive surfaces ideal for bioelectronic applications.
Area of Science:
- Polymer Chemistry
- Surface Science
- Materials Science
Background:
- Developing advanced biointerfaces is crucial for biosensing and bioelectronics.
- Existing methods often lack modularity, postfunctionalization capabilities, or desired surface properties.
Purpose of the Study:
- To present a novel surface-assisted (SurfAst) urethane polymerization method.
- To create a thin, modular, biorepellent, and electroactive polyurethane interface on gold.
- To demonstrate the postfunctionalization potential for tailored biointerfaces.
Main Methods:
- Sequential incubation of alkane diisocyanates and alkanediols on a gold surface.
- Surface characterization using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM).
- Electrostatic force microscopy (EFM) to assess long-range electrostatic interactions.
Main Results:
- Successful formation of a ∼10 to 100 nm-thick polyurethane (PU) interface.
- Characterization confirmed PU moieties, nanoporous texture (150 nm roughness), and adhesion force (14 nN).
- Demonstrated electroactivity and attraction to positively charged species; successful postfunctionalization with polyethylene glycol (PEG).
Conclusions:
- SurfAst polymerization offers a facile route to modular and postfunctionalizable biointerfaces.
- The developed PU interface exhibits desirable biorepellent and electroactive properties.
- This technique holds significant potential for fabricating advanced biointerfaces for biosensing and bioelectronics.
