Surface-Enhanced Raman Spectroscopy (SERS) Investigation of a 3D Plasmonic Architecture Utilizing Ag...

Area of Science:

• Nanotechnology
• Spectroscopy
• Materials Science

Background:

• Surface-enhanced Raman scattering (SERS) offers high sensitivity for detecting various molecules.
• SERS substrate design, particularly hotspot density, is critical for signal enhancement.
• Carbon nanowalls (CNWs) present a promising nanostructure for SERS applications.

Purpose of the Study:

• To develop and evaluate a novel SERS substrate using functionalized carbon nanowalls (CNWs) embedded with plasmonic nanoparticles (PNPs).
• To enhance hotspot density on the CNW surface for improved Raman signal amplification.
• To investigate the substrate's performance for sensitive molecular detection.

Main Methods:

• Functionalization of carbon nanowalls (CNWs) using oxygen plasma treatment.
• Embedding of plasmonic nanoparticles, specifically silver nanoparticles (Ag NPs), onto the functionalized CNWs.
• Evaluation of the SERS substrate performance using rhodamine 6G (R6G) across a concentration range from 10^-6 M to 10^-10 M.

Main Results:

• The functionalized CNW substrate with embedded Ag NPs demonstrated significantly increased hotspot density.
• A proportional increase in Raman signal intensity was observed with increasing concentrations of rhodamine 6G.
• The substrate exhibited robust Raman signals, indicating high sensitivity and reliable detection capabilities.
• The large specific surface area and graphene domains of CNWs contributed to both electromagnetic and chemical enhancement mechanisms.

Conclusions:

• The developed CNW-based SERS substrate effectively enhances Raman signal detection through increased hotspot density.
• Functionalization and incorporation of plasmonic nanoparticles are key strategies for optimizing SERS substrate performance.
• This substrate shows great potential for sensitive and quantitative analysis of molecules in various applications.