A 15 nm Thick Interlayer for Nanoscale Functional Patterning of Hard and Soft Materials

Area of Science:

• Materials Science
• Surface Chemistry
• Nanotechnology

Background:

• Controlling surface chemistry independently of mechanical properties is crucial for nanostructured materials, especially for implantation.
• Soft elastomers often exhibit heterogeneities that limit spatial resolution for surface modification.

Purpose of the Study:

• To design and demonstrate thin-film polydimethylsiloxane (TF-PDMS) interlayers for controlled ligand presentation on diverse material interfaces.
• To achieve nanometer-resolution chemical patterning independent of substrate properties.

Main Methods:

• Fabrication of highly cross-linked TF-PDMS interlayers (10-200 nm).
• Assembly of nanometer-resolution chemical patterns on highly oriented pyrolytic graphite (HOPG).
• Transfer of patterned TF-PDMS to target materials (glass, soft PDMS) via plasma bonding.

Main Results:

• Achieved nanometer-resolution chemical patterns (1 nm wide, sub-10 nm pitch) on TF-PDMS.
• Demonstrated consistent ligand presentation irrespective of the underlying material's structure or modulus.
• Leveraged modulus differences for mechanically induced microscale topographical control.
• Controlled the assembly of inorganic nanostructures (gold nanowires) using hierarchical nanoscale interface architecture.

Conclusions:

• TF-PDMS interlayers provide a versatile platform for precise surface chemistry control on various materials.
• This approach decouples surface ligand display from bulk mechanical properties.
• The method enables hierarchical nanoscale control over interface architecture, influencing nanostructure assembly.