Nanostructured plasmonic substrates for use as SERS sensors.

Area of Science:

• Nanotechnology
• Spectroscopy
• Materials Science

Background:

• Plasmonic nanostructures exhibit localized surface plasmon resonance (LSPR) upon light stimulation, strongly enhancing local electric fields.
• Molecules on these surfaces experience amplified Raman scattering, a phenomenon known as surface-enhanced Raman scattering (SERS).
• SERS provides molecular fingerprints for facile detection and chemical analysis, with sensitivity enhanced by nanostructure design.

Purpose of the Study:

• To review the state-of-the-art in fabricating SERS-active substrates.
• To discuss the application of SERS substrates as chemical and biosensors.
• To explore fabrication methods and future challenges in SERS technology.

Main Methods:

• Discussion of bottom-up nanoparticle assembly for SERS substrates.
• Overview of top-down nanolithography techniques for SERS fabrication.
• Exploration of lithography-free random nanoarray formation for SERS applications.

Main Results:

• Detailed review of three distinct nanofabrication methods for SERS substrates.
• Analysis of how nanostructure design (size, shape, composition, arrangement) impacts SERS sensitivity.
• Compilation of typical applications of SERS-based sensors in various fields.

Conclusions:

• SERS is a powerful technique for sensitive molecular detection and chemical analysis.
• Advancements in nanofabrication are crucial for developing high-performance SERS sensors.
• Future research should focus on overcoming challenges to broaden SERS applications.