Robust block copolymer mask for nanopatterning polymer films.

Area of Science:

• Materials Science
• Nanotechnology
• Polymer Science

Background:

• Self-assembly of block copolymers like polystyrene-block-polydimethylsiloxane (PS-PDMS) is crucial for creating nanostructures.
• Existing nanopatterning techniques can be complex and costly.

Purpose of the Study:

• To develop a simple, cost-effective nanofabrication technique for topographic nanopatterns.
• To utilize self-assembled PS-PDMS thin films as masks for pattern transfer.

Main Methods:

• Spin coating was used to form well-oriented PS-PDMS thin films with perpendicular cylinder morphology.
• Oxidation of PDMS blocks to silicon oxy carbide (SiOC) and degeneration of PS blocks created nanoporous SiOC films.
• Oxygen reactive ion etching (RIE) was employed for pattern transfer using the SiOC films as masks.

Main Results:

• Freestanding SiOC thin films with hexagonally packed nanochannels were fabricated.
• The SiOC films served as robust, reusable masks with high etching selectivity under oxygen RIE.
• Topographic nanopatterns were successfully generated on underlying polymeric materials.

Conclusions:

• This method offers a convenient and cost-effective approach for nanofabrication.
• The developed nanoporous SiOC thin films are effective masks for pattern transfer.
• The technique is versatile for creating nanopatterns in various polymeric materials.