Nanopatterned Monolayers of Bioinspired, Sequence-Defined Polypeptoid Brushes for Semiconductor/Bio Interfaces

Area of Science:

• Materials Science
• Nanotechnology
• Biotechnology

Background:

• Semiconductor/bio interfaces are crucial for bioelectronic devices and nanofabrication.
• Existing surface functionalization methods like self-assembled monolayers (SAMs) lack customization.
• Polymer brushes offer more chemistry options but often lack compatibility with lithography and biology.

Purpose of the Study:

• To develop a versatile polymer brush platform for precise semiconductor/bio interface engineering.
• To create bioinspired, sequence-defined polypeptoids for tailored surface modification.
• To enable advanced bioelectronic applications through controlled surface properties.

Main Methods:

• Synthesized sequence-defined polypeptoids with terminal hydroxyl groups for melt grafting onto silicon (Si) substrates.
• Formed ultrathin (∼1 nm) polypeptoid monolayers via efficient grafting.
• Utilized electron-beam lithography for nanoscale patterning of polypeptoid brushes.
• Demonstrated selective biomacromolecule immobilization (DNA origami, streptavidin) on patterned surfaces.

Main Results:

• Achieved monomer-level control over surface properties like energy, passivation, and biomolecule attachment.
• Polypeptoid brushes exhibited compatibility with electron-beam lithography, retaining integrity under harsh conditions.
• Generated highly precise, binary nanoscale patterns for addressable biomolecule arrays.
• Demonstrated versatile surface modification for specific biomolecule binding.

Conclusions:

• Bioinspired, sequence-defined polypeptoid brushes offer a highly versatile platform for engineering semiconductor/bio interfaces.
• This approach enables precise control over surface properties, facilitating the development of advanced bioelectronic devices.
• The combination of programmable polymer chemistry and lithographic patterning opens new avenues in biological nanofabrication.