Interfacial Wrinkling Structures Based on a Double Cross-Linking Strategy Enable a Dual-Mode Optical Information...

Area of Science:

• Materials Science
• Polymer Chemistry
• Optics

Background:

• Bilayer surface wrinkling is used for optical information storage and encryption.
• Delamination of skin layer and substrate poses a challenge for stability and security.

Purpose of the Study:

• To develop a stable interfacial wrinkling structure with dual-mode functionality for enhanced information security.
• To address the delamination issue in bilayer wrinkling systems.

Main Methods:

• A double cross-linking strategy was employed between a fluorescent hydrogel and polydimethylsiloxane (PDMS).
• The modulus ratio between the hydrogel and PDMS layers was controlled to regulate wrinkling behavior.
• A copolymer skin layer of acrylamide and acrylic acid was used for structural protection.

Main Results:

• A stable interfacial wrinkling structure with dual-mode functionality (light reflection and fluorescence) was successfully fabricated.
• The modulus ratio effectively regulated both the light reflection and fluorescence intensity.
• The copolymer skin layer provided protection against external damage, preserving structural integrity.
• The wrinkling structures exhibited a physically unclonable function, enhancing photoluminescence.

Conclusions:

• The double cross-linking strategy provides a robust method for creating stable, fluorescent wrinkling structures.
• These structures offer enhanced security for information storage and encryption due to their dual-mode functionality and resistance to delamination and damage.
• Potential applications include advanced information storage, anti-counterfeiting, and secure authentication systems.