Novel approach for the assembly of highly efficient SERS substrates

Area of Science:

• Nanotechnology
• Materials Science
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) and metal-enhanced fluorescence (MEF) are powerful techniques for sensitive molecular detection.
• Developing cost-efficient and scalable methods for creating SERS/MEF active substrates is crucial for widespread application.

Purpose of the Study:

• To present the properties of novel SERS-active substrates fabricated using a low-cost approach.
• To investigate the influence of nanoparticle aggregate size on local electric field enhancement.
• To demonstrate the substrate's efficiency for both SERS and MEF.

Main Methods:

• Fabrication of periodic two-dimensional (2D) matrixes of 100 nm gold nanoparticle patterns.
• Utilizing capillary assembly and soft lithography for precise, large-scale substrate generation.
• Assembling nanoparticle aggregates of varying sizes (1-6 particles) to study aggregation effects.

Main Results:

• Successful generation of precise, cost-efficient, and large-scale 2D gold nanoparticle patterns.
• Demonstrated correlation between nanoparticle aggregation and local electric field enhancement.
• High efficiency of the fabricated substrate for both SERS and MEF applications.

Conclusions:

• The developed low-cost methodology enables precise and scalable fabrication of SERS/MEF active substrates.
• Nanoparticle aggregation significantly influences local electric field enhancement, impacting signal amplification.
• The substrates are highly effective for enhancing both SERS and fluorescence signals, offering a versatile platform for sensitive detection.