Selective patterning of gold surfaces by core/shell, semisoft hybrid nanoparticles

Area of Science:

• Materials Science
• Nanotechnology
• Surface Chemistry

Background:

• Precise control over surface patterning is crucial for advanced materials and devices.
• Core/shell nanoparticles offer tunable properties for surface functionalization.

Purpose of the Study:

• To demonstrate the generation of patterned surfaces using core/shell nanoparticles.
• To investigate the selective adhesion of nanoparticles to microdomains on gold-coated silicon wafers.

Main Methods:

• Synthesis of near monodisperse core/shell nanoparticles (silica core, polystyrene shell) via reversible addition-fragmentation chain transfer (RAFT) polymerization.
• Modification of nanoparticles to introduce thiol termination.
• Immersion of gold-coated silicon wafers into dilute nanoparticle suspensions.

Main Results:

• Both as-prepared and thiol-terminated nanoparticles adhere to gold microdomains.
• Thiol-terminated nanoparticles exhibit selective adhesion to gold microdomains, enabling microdomain patterning.
• Particles with trithiocarbonate functionality provide more uniform gold surface coverage with reduced aggregation.

Conclusions:

• Core/shell nanoparticles can be effectively utilized for creating patterned surfaces.
• Thiol termination enhances the selectivity of nanoparticle adhesion for precise microdomain patterning.
• RAFT polymerization offers a viable route for synthesizing nanoparticles for surface engineering applications.