Thermoplastic polymer patterning without residual layer by advanced nanoimprinting schemes

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Nanoimprinting is a key technique for nanoscale patterning, but residual layer removal is a challenge.
• Traditional oxygen reactive-ion etching (RIE) requires vacuum, increases costs, and damages functional polymers.
• Existing methods limit the patterning of sensitive or isolated functional materials.

Purpose of the Study:

• To develop novel nanoimprinting techniques for non-destructive residual layer removal.
• To eliminate the costly and damaging oxygen RIE step in thermal nanoimprinting.
• To enable the fabrication of 3D polymer scaffolds and pattern functional polymers for electronics.

Main Methods:

• Developed solvent developing and dewetting schemes for residual layer removal in thermal nanoimprinting.
• Integrated these methods with a transfer-bonding technique for 3D scaffold fabrication.
• Demonstrated compatibility with roller nanoimprinting for large-scale applications.

Main Results:

• Successfully removed residual layers without damaging functional polymers.
• Achieved 3D polymer scaffolds using the novel techniques.
• Established a RIE-free nanoimprinting process compatible with large-scale manufacturing.

Conclusions:

• The developed nanoimprinting schemes offer a cost-effective and efficient alternative to RIE for residual layer removal.
• These techniques are suitable for patterning sensitive functional polymers, including conjugated polymers for organic electronics.
• The methods facilitate large-scale patterning and open new avenues for polymer micro- and nanostructure fabrication.