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Synthesis of SiO2@Ag Nanocomposite for Investigating Metal-Enhanced Fluorescence and Surface-Enhanced Raman
Dang Van Thai1,2, Van Ben Pham3, Cong Doanh Sai3
1Institute of Theoretical and Applied Research, Duy Tan University, Hanoi, 100000, Vietnam.
Journal of Fluorescence
|January 27, 2024
Summary
This study synthesized SiO2@Ag nanocomposites for enhanced fluorescence and Raman spectroscopy. These nanocomposites significantly amplify signals for detecting Rhodamine 6G and Malachite Green dyes at low concentrations.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Metal-enhanced fluorescence (MEF) and Surface-enhanced Raman spectroscopy (SERS) are powerful techniques for sensitive molecular detection.
- Developing novel nanocomposite materials is crucial for improving the performance of MEF and SERS.
Purpose of the Study:
- To synthesize and characterize SiO2@Ag nanocomposites.
- To evaluate the potential of these nanocomposites as substrates for MEF of Rhodamine 6G (R6G) and SERS of Malachite Green (MG).
Main Methods:
- Chemical reduction and Stöber method for synthesizing SiO2@Ag nanocomposites.
- Characterization of nanocomposite morphology and crystallite phase.
- Photoluminescence (PL) measurements for R6G.
- SERS measurements for MG.
Main Results:
- Synthesized SiO2@Ag nanocomposites with well-defined SiO2 nanosphere and Ag nanoparticle morphologies (Ag NP: 24 nm, SiO2 NC: 132 nm).
- Achieved a 133-fold increase in the photoluminescence intensity of R6G.
- Observed distinct vibrational modes for MG using SERS with an enhancement factor (EF_SERS) of 6.3 × 10^6 at 1172 cm^-1.
Conclusions:
- SiO2@Ag nanocomposites are effective substrates for both MEF and SERS.
- The synthesized material shows significant potential for highly sensitive detection of dyes at low concentrations.
