Selective self-assembly of surface-functionalized fullerenes in PS-PEO on different substrates

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Block copolymers like polystyrene-block-poly(ethylene oxide) (PS-PEO) are crucial for creating nanostructures.
• Fullerene derivatives offer unique properties for material functionalization.

Purpose of the Study:

• To investigate the self-assembly behavior of PS-PEO/C60-PS films.
• To explore the influence of C60-PS on nanostructure formation and ordering.
• To understand the role of solvent annealing on self-assembly at different interfaces.

Main Methods:

• Synthesis of C60-PS via atom-transfer radical polymerization.
• Characterization using gel permeation chromatography and thermal gravimetric analysis.
• Studying self-assembly via transmission electron microscopy on silicon wafers and at the air/water interface.

Main Results:

• C60-PS addition significantly impacts PS-PEO self-assembly, promoting lamellar microstructures.
• C60-PS integrates into the polystyrene phase, increasing domain size.
• Solvent vapor treatment modulates domain orientation and ordering.
• Long-term solvent vapor annealing at the air/water interface introduces complexity due to solvent selectivity.

Conclusions:

• C60-PS is an effective additive for directing the self-assembly of block copolymers into ordered nanostructures.
• The method provides an accessible route to tunable nanomaterial arrays.
• Solvent selectivity and annealing time are critical factors for controlling self-assembly, especially at interfaces.