ГКР-активные подложки на основе внедренных наночастиц Ag в объем c-Si: моделирование, технология, применение

A simple method for obtaining SiO2 : Ag : Si and Ag : Si hybrid nanostructures is presented. High-temperature treatment of an island film of Ag on the surface of c-Si makes it possible to preserve the plasmonic properties of Ag nanoparticles and protect them from external influences by coating them with a thermally grown layer of SiO2. The calculation of the electric field strength distribution in the structure with embedded Ag nanoparticles in c-Si demonstrates the presence of intrinsic “hot spots” at the corners of the nanoparticles, which leads to a maximum enhancement factor (~10^6) of Raman scattering. scattering. A numerical calculation of the dependence of the spectral position of a localized plasmon resonance on the geometry of structures can serve as a basis for their design in the future. Surface-enhanced Raman scattering spectroscopy showed reliable detection of the methyl orange from an aqueous solution at a concentration of 10^-5 M.