Tailoring the Mechanical Properties of 3D Microstructures Using Visible Light Post-Manufacturing

Area of Science:

• Materials Science
• Photochemistry
• Nanotechnology

Background:

• Anthracene-based photoresists offer novel routes for direct laser writing.
• Controlling mechanical properties of 3D microstructures post-fabrication is crucial for advanced applications.

Purpose of the Study:

• To investigate the visible-light-induced changes in mechanical and viscoelastic properties of 3D microstructures fabricated with anthracene photoresist.
• To establish fluorescence as a real-time indicator for mechanical property modulation.

Main Methods:

• Utilized dynamic mechanical analysis on the nanoscale to measure mechanical properties during visible light irradiation.
• Characterized photodimerization of anthracene functionalities and its correlation with mechanical changes.
• Monitored fluorescence as a consequence of photodimerization.

Main Results:

• Visible light irradiation induced significant hardening and stiffening of the microstructures.
• Increased crosslinking due to anthracene photodimerization was identified as the cause of mechanical property changes.
• A direct relationship was found between fluorescence loss and alterations in mechanical properties.

Conclusions:

• Anthracene photoresist enables visible-light-gated control over the mechanical properties of 3D microstructures.
• Fluorescence serves as a reliable proxy for monitoring real-time mechanical property adjustments.
• These photoresponsive microstructures can act as "mechanical blank slates" adaptable to various application needs.