Carbon-Dot/Silver-Nanoparticle Flexible SERS-Active Films.

Area of Science:

• Materials Science
• Nanotechnology
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) relies on plasmonic "hot spots" for signal amplification.
• Fabrication of SERS platforms often involves colloidal metal nanoparticles and surface morphology control.

Purpose of the Study:

• To develop novel SERS-active flexible films.
• To investigate the synergistic effects of carbon dots (C-dots) and silver nanoparticles (Ag NPs) within a polymer matrix for SERS sensing.

Main Methods:

• Fabrication of flexible films using polydimethylsiloxane (PDMS) embedding C-dots and coating with Ag NPs.
• Characterization of the films' physical and SERS properties.
• Testing with conventional SERS dyes and bacterial samples.

Main Results:

• The C-dot-Ag-NP-polymer films demonstrated significant SERS activity for diverse targets.
• SERS response correlated with C-dot formation and proximity to Ag NPs.
• Evidence of coupled plasmonic fields from Ag NPs and C-dot excitons contributing to SERS enhancement.

Conclusions:

• The developed flexible films offer a promising platform for SERS sensing.
• The intimate association between C-dots and Ag NPs within the polymer matrix is crucial for enhanced SERS performance.
• Coupling between plasmonic and excitonic fields is a key mechanism for signal amplification in this system.