Sensitive, Stable, and Recyclable ZnO/Ag Nanohybrid Substrates for Surface-Enhanced Raman Scattering Metrology.

Area of Science:

• Materials Science
• Nanotechnology
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) is a powerful spectroscopic technique for chemical analysis.
• Developing stable, sensitive, and reusable SERS substrates remains a significant challenge for practical applications.

Purpose of the Study:

• To develop and characterize novel ZnO/Ag nanohybrid substrates for SERS.
• To evaluate the stability, sensitivity, and recyclability of these nanohybrid substrates.

Main Methods:

• Synthesis of ZnO/Ag nanohybrid structures.
• Characterization using SERS with methylene blue as a test molecule.
• Evaluation of detection enhancement factor, stability, and recyclability.

Main Results:

• Achieved a high detection enhancement factor of 3.7 × 10^7.
• Demonstrated exceptional long-term stability attributed to localized surface plasmon resonance in Ag nanocrystals embedded in inert ZnO.
• Showcased efficient substrate regeneration and recycling with maintained high performance.
• Reached a detection sensitivity as low as 10^-12 M.

Conclusions:

• ZnO/Ag nanohybrid materials serve as highly stable, sensitive, and recyclable SERS substrates.
• These substrates offer significant potential for advanced applications in environmental monitoring, bioassays, and analytical chemistry.
• The embedded Ag nanocrystals within ZnO nanoparticles represent a novel class of nanohybrid materials for SERS metrology.