ZnO/Ag Nanostructures for Surface-Enhanced Raman Spectroscopy: Effect of Wedge Microcavity.

Authors

Olesya Kapitanova, Anastasiya V Kornilova, Nikita D Mitiushev, Irina A Veselova, Victor Yurevich Timoshenko, Andrey Nikolaevich Baranov

Published in

Nanotechnology. Sep 02, 2025. Epub Sep 02, 2025.

Abstract

Zinc oxide (ZnO) nanostructures with deposited silver (Ag) nanoparticles (NPs) exhibit exceptional opportunities for highly sensitive molecular diagnostics by means of the Surface-Enhanced Raman Scattering (SERS). Here we use the well known method of the hydrothermal synthesis of arrays of ZnO nanorods (NRs), followed with deposition of Ag-NPs by facile photochemical reduction under UV-light illumination to obtain ZnO-NRs/Ag-NPs hybrid structures with superior SERS activity. SERS spectra of a probe analyte, i.e. Rhodamine R6G molecules sorbed in an optimized ZnO-NRs/Ag-NPs structures, are detected in a wide range of the analyte concentration from 10-6 to 10-14 M. Numerical simulations of the light scattering in ZnO-NRs/Ag-NPs structures allow us to show that the wedge-like morphology of ZnO-NRs plays a crucial role in the 3D electromagnetic enhancement of the SERS signal, which can be as high as 3•108 for the lowest analyte concentration. The revealed high SERS activity of the obtained ZnO/Ag hybrid nanostructures together with the simplicity of their preparation open new prospects for their application in analytical chemistry, sensorics and photonics.

PMID:
40897203
Bibliographic data and abstract were imported from PubMed on 03 Sep 2025.

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