Homogeneous large-scale crystalline nanoparticle-covered substrate with high SERS performance.

Area of Science:

• Nanotechnology
• Materials Science
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.
• Developing cost-effective and reproducible plasmonic substrates is crucial for SERS applications.
• Existing fabrication methods often involve complex precursors or coatings.

Purpose of the Study:

• To present a novel, cost-effective nanofabrication protocol for plasmonic substrates.
• To evaluate the SERS performance, including sensitivity, homogeneity, and reproducibility, of the fabricated substrates.
• To demonstrate the utility of these substrates for analyzing biologically relevant molecules.

Main Methods:

• Physical metal evaporation technique without precursor or intermediate coating.
• Fabrication of homogeneously covered crystalline nanoparticle substrates using common laboratory equipment.
• Testing SERS performance with varying concentrations of methylene blue.
• Spectroscopic investigation of human microsomal cytochrome b5.

Main Results:

• Achieved homogeneous SERS response across the entire substrate surface.
• Demonstrated high sensitivity and reproducibility in detecting methylene blue.
• Confirmed the substrate's capability for analyzing complex biological molecules like cytochrome b5.
• The fabrication protocol is cost-effective and utilizes standard laboratory equipment.

Conclusions:

• The developed nanofabrication protocol provides a simple, cost-effective route to high-performance SERS substrates.
• The substrates exhibit excellent homogeneity, sensitivity, and reproducibility, suitable for various analytical applications.
• This platform shows promise for sensitive and reliable molecular detection in diverse fields, including biochemistry.