Dual patterning and sequential functionalization of block copolymers using photocrosslinkable random copolymer film

Area of Science:

• Polymer Science
• Materials Science
• Nanotechnology

Background:

• Block copolymers offer unique properties for advanced material design.
• Precise control over copolymer functionalization is crucial for targeted applications.
• Existing patterning methods can be limited in sequential control.

Purpose of the Study:

• To develop a novel dual patterning and sequential functionalization method for block copolymers.
• To demonstrate the capability of this method using gold nanoparticle patterning.
• To establish a versatile platform for creating complex nanostructures.

Main Methods:

• Utilized a photocrosslinkable random copolymer film: poly(styrene-r-(tert-butyl acrylate)-r-(cinnamoyloxyethyl acrylate)).
• Employed sequential deprotection of tert-butyl esters to carboxylic acids using acid catalysis and heat.
• Demonstrated sequential patterning of gold nanoparticles onto the prepared carboxylic acid patterns.

Main Results:

• Successfully achieved dual patterning and sequential functionalization of block copolymers.
• Created well-defined carboxylic acid patterns through selective deprotection.
• Showcased the ability to sequentially pattern gold nanoparticles with high fidelity.

Conclusions:

• The proposed method provides a robust approach for sequential functionalization of block copolymers.
• This technique offers significant potential for fabricating complex nanostructures and devices.
• The dual patterning strategy opens new avenues in materials science and nanotechnology.