Surface-enhanced Raman spectroscopy using silver-coated porous glass-ceramic substrates

Area of Science:

• Materials Science
• Analytical Chemistry
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) is a powerful analytical technique.
• Developing efficient and compatible SERS substrates is crucial for enhanced sensitivity.
• Porous materials offer unique surface properties for substrate development.

Purpose of the Study:

• To develop and characterize a novel silver-coated porous glass-ceramic material as a SERS substrate.
• To evaluate the performance of this new substrate for detecting various organic molecules.
• To investigate the compatibility of the substrate with different analytes.

Main Methods:

• Fabrication of porous glass-ceramic in the CaO-TiO2-P2O5 system via controlled crystallization and chemical leaching.
• Coating the porous structure with silver using radio frequency (RF) sputtering or e-beam evaporation.
• Acquisition and analysis of SERS spectra for model molecules like rhodamine 6G and crystal violet.

Main Results:

• The porous glass-ceramic exhibited pore sizes ranging from 50 nm to submicrometer.
• High-quality SERS spectra were obtained for rhodamine 6G, crystal violet, isonicotinic acid, and benzoic acid.
• The nanostructured surface effectively accommodated both the analyte molecules and the silver film, optimizing the SERS interface.

Conclusions:

• The silver-coated porous glass-ceramic is a promising new substrate for SERS applications.
• The substrate demonstrates excellent compatibility and enhanced signal acquisition for various molecules.
• The nanostructured surface design facilitates improved interaction between analytes and the silver plasmonic layer for superior SERS performance.