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Designed wrinkles for optical encryption and flexible integrated circuit carrier board
Shilong Zhong1,2,3, Zhaoxiang Zhu4, Qizheng Huo5
1School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, China.
Nature Communications
|July 4, 2024
Summary
This study introduces a novel wrinkling strategy for polymers, enabling uniform pattern formation and advanced optical anti-counterfeiting. The technique also facilitates high-density flexible integrated circuit carrier boards.
Area of Science:
- Materials Science
- Polymer Science
- Nanotechnology
Background:
- Polymer patterns often exhibit mechanical property mismatches with substrates, leading to defects like detachment.
- Existing methods struggle to create uniform, stable patterns on polymer surfaces.
Purpose of the Study:
- To develop a new strategy for creating uniform polymer wrinkles.
- To enable multi-image optical anti-counterfeiting using switchable images.
- To fabricate high-density flexible integrated circuit (IC) carrier boards.
Main Methods:
- Utilizing photolithography for light-induced polymer crosslinking to define stress distribution areas.
- Controlling residual solvent diffusion to redistribute stress for uniform wrinkling.
- Employing thermal polymerization for pattern and substrate material compatibility.
- Applying a full-additive process for creating fine copper circuits on wrinkled polyimide films.
Main Results:
- Achieved uniform wrinkles without force relaxation issues.
- Demonstrated the ability to record and hide up to eight switchable images, readable without crosstalk.
- Fabricated flexible IC carrier boards with 400% higher copper wire density than current industry standards.
- Ensured the developed technology meets industrialization standards.
Conclusions:
- The wrinkling strategy offers a robust method for creating defect-free polymer patterns.
- The technology provides a promising solution for advanced optical anti-counterfeiting applications.
- The developed flexible IC carrier boards represent a significant advancement in electronic component manufacturing.
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