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ZnO/Ag nanostructures for surface-enhanced Raman spectroscopy: effect of wedge microcavity.
Olesya Kapitanova1, Anastasiya V Kornilova2, Nikita D Mitiushev3,4
1Faculty of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, Moscow 119991, Russia.
Nanotechnology
|September 2, 2025
Summary
Silver nanoparticles on zinc oxide nanorods create highly sensitive Surface-Enhanced Raman Scattering (SERS) sensors. These novel hybrid structures enable sensitive molecular diagnostics for Rhodamine R6G detection.
Area of Science:
- Materials Science
- Nanotechnology
- Analytical Chemistry
Background:
- Silver nanoparticles (Ag-NPs) enhance Surface-Enhanced Raman Scattering (SERS) for molecular diagnostics.
- Zinc oxide (ZnO) nanostructures offer a versatile platform for SERS applications.
Purpose of the Study:
- To develop highly sensitive ZnO nanorods/Ag-NPs hybrid structures for SERS-based molecular diagnostics.
- To investigate the role of ZnO nanorod morphology in SERS signal enhancement.
Main Methods:
- Hydrothermal synthesis of ZnO nanorod arrays.
- Photochemical reduction of Ag-NPs onto ZnO nanorods under UV light.
- SERS measurements of Rhodamine R6G at various concentrations.
Main Results:
- Achieved superior SERS activity in ZnO-NRs/Ag-NPs hybrid structures.
- Detected Rhodamine R6G over a wide concentration range (10-6 to 10-14 M).
- Demonstrated a SERS signal enhancement factor as high as 3x10^8.
Conclusions:
- The wedge-like morphology of ZnO nanorods is crucial for 3D electromagnetic enhancement of SERS signals.
- Simple preparation of ZnO/Ag hybrid nanostructures offers new prospects for analytical chemistry, sensorics, and photonics.
