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Using a Functional Wool Keratin Photoresist to Build Iridescent and Fluorescent 3D Micro-Pattern for Dual-Mode

Shuang Xia1, Qinghong Lu1, Chaoyu Fan1

  • 1Department of Physics, Research Institute for Biomimetics and Soft Matter, Fujian Provincial Key Laboratory for Soft Functional Materials Research, Xiamen University, Xiamen, 361005, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 7, 2025
PubMed
Summary

Researchers developed a novel bio-photoresist using wool keratin (WK) and gold nanoclusters (AuNCs). This enables dual-mode optical anti-counterfeiting with iridescent and fluorescent micro-patterns for enhanced security.

Keywords:
dual‐mode anti‐counterfeitingfluorescencesoft lithographystructural colorwool keratin

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Optics

Background:

  • Bio-nanostructures are crucial for bioelectronics, bio-optical devices, and biomedicine.
  • Soft lithography is an efficient technique for creating intricate micropatterns.
  • Developing biocompatible and functional materials for advanced applications is essential.

Purpose of the Study:

  • To develop a photoresponsive bio-photoresist from wool keratin (WK).
  • To create iridescent and fluorescent micro-patterns using WK and gold nanoclusters (AuNCs).
  • To enable dual-mode optical anti-counterfeiting applications.

Main Methods:

  • Chemical modification of wool keratin (WK) with glycidyl methacrylate.
  • UV light-initiated radical polymerization for cross-linking the bio-photoresist.
  • Soft lithography to fabricate 3D WK micro-patterns.
  • In situ generation of AuNCs within the WK matrix.

Main Results:

  • Fabrication of stable, biocompatible, and degradable 3D WK micro-patterns (positive and negative).
  • Demonstration of iridescent micro-patterns with excellent diffraction efficiency.
  • Generation of fluorescent WK/AuNCs bio-photoresist with significant fluorescence.
  • Successful application of hybrid micro-patterns for dual-mode optical anti-counterfeiting.

Conclusions:

  • A mild, aqueous method successfully created a functional bio-photoresist from wool keratin.
  • The developed WK/AuNCs hybrid micro-patterns offer dual-mode optical properties for anti-counterfeiting.
  • This approach enhances information storage and encryption security through advanced optical features.