Sensitized excited free-radical processes as read-write tools: impact on non-linear lithographic processes

Area of Science:

• Polymer chemistry
• Photochemistry
• Materials science

Background:

• Developing novel photoresponsive materials is crucial for advanced imaging and data storage.
• Existing methods often lack the resolution or reversibility required for sophisticated applications.

Purpose of the Study:

• To synthesize and characterize a novel prefluorescent radical probe.
• To demonstrate its utility in polymer functionalization and rewritable data storage.
• To explore its potential in sub-diffraction lithography.

Main Methods:

• Synthesis of a coumarin-sensitized 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) radical probe.
• Visible light irradiation to induce energy transfer and subsequent hydrogen abstraction from a polymer.
• Thermal treatment to reverse the functionalization process.
• High-intensity illumination for bleaching the fluorescent probes.

Main Results:

• Successful synthesis of the coumarin-TEMPO prefluorescent radical probe.
• Demonstration of light-induced polymer functionalization via excited TEMPO.
• Reversibility of the polymer functionalization achieved through thermal treatment.
• Bleaching of fluorescent probes under high illumination, enabling dual-tone lithography.

Conclusions:

• The developed probe enables light-induced, thermally reversible polymer functionalization.
• The material shows promise for dual-tone and sub-diffraction lithography.
• This work introduces a new class of photoresponsive materials for advanced patterning applications.