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SHIELD: A Spin-Coated Hydrophobic Interface for Extended Low-Fouling Durability.

Hyojun Lee1, Beomsu Park1, Jumi Kang1

  • 1Department of Chemistry, Kyungpook National University, Daegu 41566, South Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 27, 2026
PubMed
Summary

A novel fluorinated copolymer coating, SHIELD, offers a simple and stable solution to prevent protein adsorption in biosensors. This hydrophobic surface modification enhances measurement accuracy and antifouling performance across various substrates.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Surface Chemistry

Background:

  • Non-specific protein adsorption on biosensor surfaces reduces measurement accuracy.
  • Existing hydrophilic and zwitterionic modifications suffer from chemical instability and complex synthesis.
  • A need exists for robust, easily applicable antifouling surface coatings.

Purpose of the Study:

  • To develop a simple, stable, and effective hydrophobic coating for biosensor applications.
  • To create a fluorinated copolymer-based surface modification termed SHIELD.
  • To evaluate the antifouling performance and substrate applicability of the SHIELD coating.

Main Methods:

  • Synthesized a copolymer from 2,2,2-trifluoroethyl methacrylate and n-butyl acrylate.
  • Applied the copolymer uniformly onto diverse substrates using a single-step spin-coating process.
  • Assessed antifouling performance via protein adsorption and cell adhesion assays.

Main Results:

  • The SHIELD coating demonstrated strong antifouling properties against protein and cell adhesion.
  • The coating exhibited low surface energy and enhanced hydrophobicity due to fluorination.
  • Coating thickness was tunable by adjusting polymer concentration, allowing optimization of efficacy.
  • The coating was stably and reproducibly applied to various substrates.

Conclusions:

  • The SHIELD coating presents a facile and robust surface modification strategy for antifouling applications.
  • This approach effectively addresses limitations of current surface modification techniques in biosensing.
  • The tunable and stable nature of SHIELD holds significant potential for improving biosensor reliability.