Plasmonic Metasurfaces Based on Pyramidal Nanoholes for High-Efficiency SERS Biosensing.

Area of Science:

• Nanotechnology
• Biosensing
• Spectroscopy

Background:

• Pathogen detection is crucial for public health and environmental monitoring.
• Current methods often require complex amplification and large sample volumes.
• Developing rapid, sensitive, and label-free detection platforms is a significant challenge.

Purpose of the Study:

• To design and fabricate a nanoscale inverted pyramidal metasurface for pathogen detection.
• To develop a label-free on-chip platform integrating nanotechnology and surface-enhanced Raman scattering (SERS).
• To demonstrate a highly sensitive virus immunoassay for hepatitis A virus detection.

Main Methods:

• Fabrication of an inverted pyramidal metasurface at the nanoscale.
• Integration of nanotechnology with surface-enhanced Raman scattering (SERS) for enhanced sensitivity.
• Development of a virus immunoassay for label-free detection.

Main Results:

• Achieved highly sensitive detection of hepatitis A virus (HAV) at a minimal concentration of 13 pg/mL.
• Demonstrated detection in a very small volume (2 μL) without complex signal amplification.
• Validated the platform as a proof of concept for a label-free pathogen detection system.

Conclusions:

• The developed SERS nanobiosensor offers a promising solution for rapid and sensitive pathogen detection.
• This technology can be applied to early and easy water monitoring.
• The platform merges nanotechnology and SERS for high-flux and high-accuracy pathogen identification.