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Fabrication of Large-area Free-standing Ultrathin Polymer Films
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A Robust and Reliable Optical Encryption Film.

Seong Min Kim1, Joon Hyung An1, Dong Hyeon Seong1

  • 1Department of Mechanical Engineering, Sogang University, Seoul 04107, Republic of Korea.

ACS Applied Materials & Interfaces
|March 12, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel optical encryption film for anticounterfeiting. The film rapidly switches between opaque and transparent states using water, offering improved speed and stability over existing technologies.

Keywords:
anticounterfeitcopolymerizationinverted-pyramidaloptical encryptionpolymer brush

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Area of Science:

  • Materials Science
  • Optics
  • Polymer Chemistry

Background:

  • Reliable anticounterfeiting technologies are vital for industry, user safety, and health.
  • Optical methods using water infiltration, inspired by Diphylleia grayi, show promise but face challenges like slow response and poor stability.
  • Existing techniques require improvement in speed, reversibility, and long-term durability.

Purpose of the Study:

  • To develop a novel optical encryption film with rapid, reversible optical transitions for anticounterfeiting.
  • To overcome limitations of existing water-infiltration-based optical anticounterfeiting methods.
  • To enhance security and stability in anticounterfeiting applications.

Main Methods:

  • Fabrication of an optical encryption film by integrating micropyramidal hole structures with copolymerized hydrophilic polymer brushes.
  • Utilizing microstructures for structural light scattering and physical protection of polymer brushes.
  • Leveraging hydrophilic polymer brushes for rapid water infiltration and evaporation.

Main Results:

  • Achieved a reversible transition between opaque (transmittance ~0.87%) and transparent (transmittance ~88.5%) states upon water infiltration.
  • Demonstrated fast response and recovery times due to rapid water management by polymer brushes.
  • The micropyramidal structures provided durability and protected the polymer brushes.

Conclusions:

  • The developed polymeric encryption film offers a promising solution for advanced anticounterfeiting.
  • The integration of microstructures and hydrophilic polymer brushes enhances performance and stability.
  • The film shows potential for practical anticounterfeiting applications with improved efficiency and reliability.