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Highly Sensitive Humidity-Responsive Photonic Films Integrated with MATLAB Programs for an Advanced Security

Yiman Sun1, Bo Wang2, Ruikang Sun1

  • 1State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China.

ACS Applied Materials & Interfaces
|October 7, 2025
PubMed
Summary

This study introduces a novel humidity-responsive photonic crystal (HPC) system for advanced security authentication. The system uses breath to reveal hidden information on labels, offering a high-security solution against counterfeiting.

Keywords:
anticounterfeitinghumidity-responseintelligent packagingphotonic crystalsstructural color

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optics

Background:

  • Counterfeit products necessitate advanced authentication technologies.
  • Humidity-responsive materials offer unique sensing capabilities.

Purpose of the Study:

  • To develop a humidity-responsive photonic crystal (HPC)-based security authentication system.
  • To create a high-security label triggered by human breath.
  • To integrate the system with a MATLAB application for enhanced security.

Main Methods:

  • Fabrication of HPC films by infiltrating hydrophilic copolymers (OEGA480) into ZnS@SiO2 opaline templates.
  • Characterization of reflection wavelength shifts and color variations across a range of relative humidity (RH).
  • Development of an anticounterfeiting code label with multilevel information concealed in ambient humidity.

Main Results:

  • HPC films exhibited a 150 nm reflection wavelength shift with distinct color changes from 11-90% RH.
  • Sensing balance was achieved in 150 ms, enabling real-time colorimetric humidity sensing.
  • Multilevel humidity responsiveness with reflection wavelength shifts exceeding 400 nm was demonstrated.

Conclusions:

  • The developed HPC system provides a robust, breath-triggered security authentication method.
  • The integration with a MATLAB application enhances security through RGB color verification and digital encoding accuracy.
  • This technology offers a promising solution for high-security anticounterfeiting labels.