Large-scale plasmonic nanodisk array as a biosensing platform fabricated by transfer nanoprinting

Area of Science:

• Nanotechnology
• Plasmonics
• Biosensing

Background:

• Surface plasmon resonance (SPR) using nanostructures is vital for biomolecule detection.
• Traditional fabrication methods (e.g., electron beam lithography) are costly and limited in scale.
• Need for cost-effective, large-area nanostructure fabrication for enhanced biosensing.

Purpose of the Study:

• To develop a centimeter-scale, ordered nanostructure fabrication method for SPR biosensing.
• To demonstrate a novel plasmonic platform with high sensitivity and performance.
• To explore the application of this platform in biomolecule detection.

Main Methods:

• Utilized transfer nanoprinting with an ultrathin anodic aluminum oxide membrane.
• Fabricated centimeter-scale ordered periodic Ag-ZnS bilayer nanodisks on a gold film.
• Experimentally demonstrated surface plasmon polariton Bloch mode and investigated surface sensitivity using polyelectrolyte bilayers.

Main Results:

• Achieved large-scale fabrication of periodic Ag-ZnS bilayer nanodisks with a low-cost, simple process.
• Demonstrated a surface plasmon polariton Bloch mode at normal light incidence.
• Obtained a high refractive index bulk sensitivity of 438 nm/RIU.
• Validated the platform's surface sensitivity using controlled polyelectrolyte coatings.

Conclusions:

• The developed transfer nanoprinting method enables cost-effective, large-scale fabrication of plasmonic nanostructures.
• The Ag-ZnS bilayer nanodisk platform exhibits excellent bulk and surface sensitivity for biosensing.
• This large-scale plasmonic bilayer nanoparticle biosensing platform holds significant promise for low-cost, high-performance biosensor development.