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Dynamic wrinkling pattern exhibiting tunable fluorescence for anticounterfeiting applications.

Tianjiao Ma1, Tiantian Li1, Liangwei Zhou1

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Researchers developed a dynamic dual pattern surface for information security. This smart surface changes wrinkle patterns and fluorescence color (blue to orange-red) reversibly using light or acid, aiding anticounterfeiting efforts.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Surface Engineering

Background:

  • Dynamic surface patterns with tunable topography and fluorescence are crucial for information security and anticounterfeiting applications.
  • Existing methods often lack simultaneous control over both surface morphology and optical properties.
  • Supramolecular networks offer versatile platforms for creating responsive materials.

Purpose of the Study:

  • To demonstrate a dynamic dual pattern system capable of reversible changes in both surface topography and fluorescence.
  • To investigate the use of a supramolecular network comprising pyridine-containing copolymers (P4VP-nBA-S) and hydroxyl distyrylpyridine (DSP-OH) for this purpose.
  • To explore the regulation mechanisms triggered by visible light and acid stimuli.

Main Methods:

  • Fabrication of bilayer wrinkling systems with a skin layer composed of P4VP-nBA-S and DSP-OH.
  • Stimulation of the system using 450 nm visible light and acid treatment.
  • Characterization of surface morphology changes (wrinkling and smoothing) and fluorescence shifts.
  • Investigation of acid-induced protonation of pyridines and its effect on cross-linking and fluorescence.

Main Results:

  • Simultaneous and reversible control over wrinkle morphology and fluorescence color was achieved.
  • Visible light irradiation or acid treatment induced dynamic changes from a smooth to a wrinkled state.
  • Fluorescence color shifted dynamically from blue to orange-red upon stimulation.
  • Acid-induced protonation of pyridines modulated the cross-linking of the skin layer and DSP-OH fluorescence.

Conclusions:

  • The developed smart surfaces exhibit dynamic hierarchical wrinkles and fluorescence, offering a novel approach for information recording and anticounterfeiting.
  • The supramolecular network provides a versatile platform for creating stimuli-responsive materials with dual functionalities.
  • Potential applications in advanced anticounterfeiting technologies and secure information storage are highlighted.